Database Users

4G and WiFi Not Compatible?

I had been having problems getting 4G at home and just noticed that if I turn off WiFi, 4G pops right up and as soon as I re-enable WiFi (which connects to my home network) 4G disconnects. Has anyone seen this behavior? When you think about it, it makes perfect sense, and since both are enabled to connect when the other one isn't, the flip-flop is automatic. But it surprised me.

its probably because sprints 4G is based on WIFI. or it just cuts off 4G cus you dont need it anymore

I believe it works the same way as WiFi and EVDO works on older phones. When you turn on WiFi it will use that as your data connection instead of EVDO regardless if it is a crappy WiFi connection.
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Sent via the Sprint HTC EVO

Yeah, it's actually pretty cool, but if you don't know about it, it gets frustrating. I called Sprint customer service and he had me go through the battery out/in routine and go outside and try, etc. So maybe they don't know about it either!
But it makes sense for Sprint, since their data plan is unlimited and they want to avoid network overloading (are you listening AT&T? LOL). The only thing you miss on WiFi are location-based sevices that rely on GPS (navigation, some weather products, etc.).

dkdontforget said:
its probably because sprints 4G is based on WIFI. or it just cuts off 4G cus you dont need it anymore
Click to expand...
Click to collapse
WiFi and 802.16e aren't all that similar. LOTS of differences between the protocols.
Maybe there's some isolation problems on your device as Sprint is using their 2.5 GHz spectrum holdings for their 4G network.

4g network and 3g network both will shut off when enabling wifi. Why have 2 forms of data going at the same time? Its not gunna use both to double your speeds.
You wont lose any GPS features. Turn on wifi and load up Google Maps, it will find your location exact.
When making calls and sending text it uses 1x so you will still receive everything except for MMS. Maybe they fixed it to where you can receive them even when on wifi with the Evo, not 100% sure.

4g and WiFi are both data only connections. You don't need two data connections simultaneously so it is smart enough to auto disable one to save battery. It would also cause routing problems.

Every phone does this LOL When you switch on Wifi they turn off 2g,3g,4g etc because you can't use 2 data connections at the same time.
I'm curious why you would want 4g and wifi on at the same time?

I thought this was pretty common knowledge (on any Android phone)... And I also thought it was done for battery conservation reasons as much as anything else. WiFi's a simpler point to point connection and from what I understand it sucks less power than 3G or 4G which is constantly checking for additional cell towers in case you've moved, etc.
If you're at home or at work w/a stable WiFi connection you should be able to preserve more battery power by using it, within the settings you can even set it so the phone doesn't revert to 3G when it goes to sleep (the default setting IIRC), otherwise it does this and only jumps back to WiFi when you wake it ('till you're out of range anyway).

I agree with all the comments. And if the Sprint Customer Service guys had said, "Hey, you idiot...it's supposed to do that," then I wouldn't have posted. But the fact that he was as stumped as I was prompted me to post (we all know that Sprint gets all it's info from reading these forums...LOL).

[Q] Intermittent Limited Service?

Hi All,
first off, thank you all for this amazing collection of information on this device and the rest of the android world. I have been a reader since I got my first MT3G in April of '10.
quick question. I noticed that every so often my phone (MT4G) loses its service connection. (little x over the bars in the notification panel) when this happens, I cannot call, text or access the internet. it usually cycles back on after a couple minutes. the fact that it comes back and it has happened both at work and at home makes me think its my phone's radio and not a tower issue.
stock rom
I do have the network mode set to WCDMA only.
anyone else have this issue? any thoughts or suggestions?

I've only seen this in an area that had no t mobile coverage. I assume this meant it was on an at&t tower for emergency calls only.
Could also be a sim issue but I'm not suggesting anything specific.
Does this happen with umts enabled?
Sent from my HTC Glacier using XDA App

hhmm.. the sim is pretty new, i think i converted from my old voicestream card to a new tmo card when i got the mt3g last year...
honestly, i don't think i had this issue when it was set to gsm/wcdma auto.
I guess i'll try turning the network setting back to that and see if the problem persists.
Thanks!

bgkk said:
Hi All,
first off, thank you all for this amazing collection of information on this device and the rest of the android world. I have been a reader since I got my first MT3G in April of '10.
quick question. I noticed that every so often my phone (MT4G) loses its service connection. (little x over the bars in the notification panel) when this happens, I cannot call, text or access the internet. it usually cycles back on after a couple minutes. the fact that it comes back and it has happened both at work and at home makes me think its my phone's radio and not a tower issue.
stock rom
I do have the network mode set to WCDMA only.
anyone else have this issue? any thoughts or suggestions?
Click to expand...
Click to collapse
When you have it set "wcdma only" its only going to connect to 3g/4g. T- mobile's 3g is very spotty so it going to drop signal every now and then. If you switch it to "gsm or wcdma" it will pick up "edge" also so you won't lose signal. If I'm wrong, someone correct me.
Sent from my HTC Glacier using XDA App

STOP taking the Network Mode away AT&T!!!

I love my new Galaxy S III, but once again I have no way to force HSPA+ only. I need this option while my phone sits in my desk all day. If I can turn LTE off then I can save battery life and still get calls/texts/emails.
STOP IT AT&T, JUST STOP IT!!! Your really starting to really aggravate your customers by not allowing them to select their preferred network.
I want the network mode option in mobile networks:
GSM/HSPA/LTE (Auto)
GSM/HSPA (Auto)
HSPA (only)
GSM (only)
STOP taking this off all your phones. Every other GSM carrier in the world allows this except you!!!
I hope ALL developers add this toggle in all the upcoming roms.

Your best bet until this is added/fixed, is to turn on wi-fi mode and turn off the mobile data connection.
That way you still can make calls, and have the wifi as your data, and if its off it wont use as much power as HSPA/LTE.

mastarifla said:
Your best bet until this is added/fixed, is to turn on wi-fi mode and turn off the mobile data connection.
That way you still can make calls, and have the wifi as your data, and if its off it wont use as much power as HSPA/LTE.
Click to expand...
Click to collapse
I think you kind of missed the point...
Let's say your at work all day and you don't use your phone much? Let's say your phone gets 1 bar of LTE and 4 of HSPA+. The signal constantly fluctuates ultimately leading to a dead battery much faster.
Wouldn't it be great to just turn LTE off? That way my phone gets a better signal and uses less battery life. Not to mention, I can still receive calls, texts, and e-mails, whereas airplane mode disables everything.
Wi-Fi isn't available everywhere.
PS: AT&T ain't adding ****, they released their first LTE device in November of 2011 and it also lacked this option.

I think you missed the point as well
The reason for turning on wi-fi is to direct the data connection to something other than the chip used for HSPA/LTE. I'm not looking to use the wi-fi connection as an alternative data source. I'm using it to prevent as much battery drain as possible whenever I am not using the phone.
It essentially IS turning off LTE, but it also is turning off your data, and if you don't have wi-fi then you wont have a data connection, but if you do then you will.
Airplane mode is just taking it a step further and blocking calls as well.

So there's no way to turn off LTE? Even via a 4g/3g toggle from the app store?

916x10 said:
So there's no way to turn off LTE? Even via a 4g/3g toggle from the app store?
Click to expand...
Click to collapse
Nope, that's not how it worked on the HTC One X... even dialer codes would just reset on exiting. LTE stays on for some stupid reason with ATT.
A bet a toggle with root requirements will come out later./

mastarifla said:
I think you missed the point as well
The reason for turning on wi-fi is to direct the data connection to something other than the chip used for HSPA/LTE. I'm not looking to use the wi-fi connection as an alternative data source. I'm using it to prevent as much battery drain as possible whenever I am not using the phone.
It essentially IS turning off LTE, but it also is turning off your data, and if you don't have wi-fi then you wont have a data connection, but if you do then you will.
Airplane mode is just taking it a step further and blocking calls as well.
Click to expand...
Click to collapse
Ok? What if you don't have Wifi and your in a very spotty LTE area with fluctuating signal?
Nevertheless, we need the toggle!!!

What about an APN switcher, would that work?

916x10 said:
What about an APN switcher, would that work?
Click to expand...
Click to collapse
Nope, many have tried this but it doesn't stick. We need AT&T to add the option under mobile networks.

MattMJB0188 said:
Ok? What if you don't have Wifi and your in a very spotty LTE area with fluctuating signal?
Nevertheless, we need the toggle!!!
Click to expand...
Click to collapse
Then it would be best to turn off the Wi-fi and the Mobile Data connection, the only reason I have the Wi-fi on is if I'm in an area that has it (home, work, at&t hotspot) otherwise it is automatically turned off (I think?).
And I agree completely, I would love that feature, but until that time we have to make due with what we have, this is my solution, it isn't perfect but it works for me.

mastarifla said:
Then it would be best to turn off the Wi-fi and the Mobile Data connection, the only reason I have the Wi-fi on is if I'm in an area that has it (home, work, at&t hotspot) otherwise it is automatically turned off (I think?).
And I agree completely, I would love that feature, but until that time we have to make due with what we have, this is my solution, it isn't perfect but it works for me.
Click to expand...
Click to collapse
Yes, but like I said turning off mobile data completely turns off the data connection, whereas with this toggle we can change it to EDGE or HSPA+ only, still having a data connection.

I agree I like turning on edge only when I'm at work and home
Sent from my SAMSUNG-SGH-I747 using xda premium

I'm just hoping developers starting adding the GSM toggle via Mobile networks in their custom roms.
AT&T NEVER WILL!!!

It could be the sim card. I have a SIM card from 2007. The network toggle still works on my Thrill. Someone put a newer SIM card in their Thrill and the network toggle is gone. http://forum.xda-developers.com/showthread.php?t=1326760 post 27

cproaudio said:
It could be the sim card. I have a SIM card from 2007. The network toggle still works on my Thrill. Someone put a newer SIM card in their Thrill and the network toggle is gone. http://forum.xda-developers.com/showthread.php?t=1326760 post 27
Click to expand...
Click to collapse
And you hit the nail on the head. It's actually a mix of SIM Card and Radio. What we need is the canadian version of our radio and we will have it back.

Erm would juice defender not fix this? I still get texts and calls but it turns off my data.. plus its free! ( i bought the ultimate though)
Sent from my Axiom MAXX!!

benefit14snake said:
Erm would juice defender not fix this? I still get texts and calls but it turns off my data.. plus its free! ( i bought the ultimate though)
Sent from my Axiom MAXX!!
Click to expand...
Click to collapse
i guess technically it could since it turns off everything (Except calls) and turns it all back on every 15 minutes to check if anything was received on Att servers.
But if hes waiting for an important text or something, it would come delayed until juice defender decided to retrieve it.
not a bad idea though.

Here's an idea, since your at a desk all day, invest $1.32 on monoprice into a USB cable and charge your phone...
Sent from my HTC One X using Tapatalk 2

doctorTJ said:
i guess technically it could since it turns off everything (Except calls) and turns it all back on every 15 minutes to check if anything was received on Att servers.
But if hes waiting for an important text or something, it would come delayed until juice defender decided to retrieve it.
not a bad idea though.
Click to expand...
Click to collapse
I believe it just turns off 3g and 4g on verizon. My calls and texts are instant. Also, if you buy the app you can change frequency. Mine syncs every hour or two. It may be different with att since verizon handles their 4g in kind of a silly way.
Sent from my Axiom MAXX!!

bloodrain954 said:
Here's an idea, since your at a desk all day, invest $1.32 on monoprice into a USB cable and charge your phone...
Click to expand...
Click to collapse
You mean cycle it twice as much as necessary since AT&T has removed the functionality that's needed? :good:

[Q] Dropping data connection

anyone experiencing data drops particularly when the phone is in weak 4G coverage? It acts like it cant switch between 4G and 3G. sometimes it might take 5 min or more before it will reconnect to data. the phone works fine when it is in a strong signal area. So far I have just experienced this behavior in low signal coverage.

Yesss! Experienced that yesterday. But came back on in 5 min. Usually fixed when u go to settings and switch from the lte to GSM and back to lte but haven't had trouble with it today
Sent from my XT907 using Tapatalk 2

check this thread: http://forum.xda-developers.com/showthread.php?t=1893010
has links to other threads as well
Yours is the first case I've seen where data drops altogether, most have just been going back to 3G too often.

jntdroid said:
check this thread: http://forum.xda-developers.com/showthread.php?t=1893010
has links to other threads as well
Yours is the first case I've seen where data drops altogether, most have just been going back to 3G too often.
Click to expand...
Click to collapse
I am having the no data issue as well! I leave my house (on wifi and supposedly 3G or 4G) and I want to start listening to music immediately in my car but I have no data connection once wifi is off. It can take over a minute or more to get a data connection! I was wondering if this had to do with LTE protocol negotiation, as this is my first 4G phone. However it seems way too slow and its very aggravating. When it does get data back, it is usually 4G not 3G. Toggling data mode on and off doesn't fix it. I have not yet tried toggling between CDMA and GSM.

emkman said:
I am having the no data issue as well! I leave my house (on wifi and supposedly 3G or 4G) and I want to start listening to music immediately in my car but I have no data connection once wifi is off. It can take over a minute or more to get a data connection! I was wondering if this had to do with LTE protocol negotiation, as this is my first 4G phone. However it seems way too slow and its very aggravating. When it does get data back, it is usually 4G not 3G. Toggling data mode on and off doesn't fix it. I have not yet tried toggling between CDMA and GSM.
Click to expand...
Click to collapse
does it only happen when you're leaving wifi and going to cell data?

My experience with data connection was spotty for the first couple days. Going from WiFi into 4G then 3G on the way to work required a reboot to pick up the 3G after I arrived.
I think I may have found my issue.
Settings -> More... -> Mobile Networks -> Network Mode
Was originally set to "Global". I've found that "LTE/CDMA" works better for me.
hope this helps some.

Sprint WiFi Calling doesn't work after Nougat Upgrade

My wife and I live up in the foothills of Colorado where there are no Sprint cell towers. There is one cell tower which our Sprint S7 edges can barely pick up that comes and goes and indicates that we are roaming. For a few seconds our phones might see it but then it will go away for minutes, then it will come back only to go away again ... etc. In any event, it was necessary to use Wifi calling when we are at my home. Prior to the Nougat upgrade everything was fine. As soon as we walked into the house our S7 edges would connect, Wifi calling would activate and would be functional. After the Nougat update we have discovered that Wifi calling no longer works unless we can also see that one roaming cell tower. Then Wifi calling turns on, stays on and we can make/receive calls. I emphasize that this behavior occurs with both our phones.
This problem makes all the Sprint stores basically useless. Since they are located where there are towers, Wifi calling works as expected. As a result Sprint has been absolutely no help. I am wondering if anybody else has had problems with Sprint Wifi calling when unable to see a cell tower? If so could you work around the problem? I am open to suggestions. I consider this a bug in the Spring S7 edge firmware.
BTW, I know that when I can make a call, Wifi calling is used because the pop-up "Congratulations you just made a Wifi call" appears. I purposedly have not turned that off to be sure I am not using that one roaming tower. What is interesting is that I only need to be able to see the "R" by the triangle showing cell tower strength (don't need any bars) and then the Wifi calling icon will turn on. At that point I can make a phone call and even if I lose the connection to that one cell tower (i.e. the "R" disappears) the Wifi call will remain active. I can go anywhere in my house and not drop the call. But once I hang up, the Wifi calling icon will gray out with a slash through it, the phone will indicate that there is no network and the phone can only make emergency calls.
If I cannot get a fix to this problem then I might just have to go back to the last Marshmallow firmware and block the update if possible.

just for the hell of it to check, I turned on airplane mode and left it for 5 mins, leaving it on turned wifi on, and wifi calling connected within a few seconds of wifi connecting. I am on the nougat update. I have absolutely no cell signal as that is turned off. I am able to make calls without a problem.
Reboot your phone into recovery and clear cache and try again.
also, you may want to check and make sure "smart switch" is turned off. it's under the connections > wifi > advanced > smart network switch. I haven't tested it, but in theory it might demand you be connected to a cellular network to work and be causing your problem.

nosympathy said:
just for the hell of it to check, I turned on airplane mode and left it for 5 mins, leaving it on turned wifi on, and wifi calling connected within a few seconds of wifi connecting. I am on the nougat update. I have absolutely no cell signal as that is turned off. I am able to make calls without a problem.
Reboot your phone into recovery and clear cache and try again.
also, you may want to check and make sure "smart switch" is turned off. it's under the connections > wifi > advanced > smart network switch. I haven't tested it, but in theory it might demand you be connected to a cellular network to work and be causing your problem.
Click to expand...
Click to collapse
Thanks for the suggestions. I tried several things. First I verified that I already had "smart switch" turned off. So I went ahead and turned it back on... no love with that feature either turned on or off. Second, I rebooted as you suggested into recovery and cleared the cache. That also did not fix the problem. Third I tried the same experiment as you and turned on airplane mode. I waited a bit (maybe not the same 5 minutes) and then turned on the Wifi and Wifi calling. Again no love. I even tried to make a call and the phone told me I had to turn off airplane mode. For whatever reason Wifi calling will only activate when the phone can see that one tower and starts roaming. At least I can use your experiment to demonstrate the problem at a Sprint store. I might just try using Odin to flash nougat and start clean and see if I cannot get this to work that way. I really don't want to go back to using the Airave although that was pretty reliable for me.

Paul Ganci said:
Thanks for the suggestions. I tried several things. First I verified that I already had "smart switch" turned off. So I went ahead and turned it back on... no love with that feature either turned on or off. Second, I rebooted as you suggested into recovery and cleared the cache. That also did not fix the problem. Third I tried the same experiment as you and turned on airplane mode. I waited a bit (maybe not the same 5 minutes) and then turned on the Wifi and Wifi calling. Again no love. I even tried to make a call and the phone told me I had to turn off airplane mode. For whatever reason Wifi calling will only activate when the phone can see that one tower and starts roaming. At least I can use your experiment to demonstrate the problem at a Sprint store. I might just try using Odin to flash nougat and start clean and see if I cannot get this to work that way. I really don't want to go back to using the Airave although that was pretty reliable for me.
Click to expand...
Click to collapse
So question is, if you go somewhere with signal and wifi you can connect too, turn on airplane mode, leave it on and turn wifi on, does wifi calling work. If not then for sure a reset is in order.
If it does work, then that just tells me the phone isn't really turning everything off with airplane mode on (which is lame) and sprint just goofed up the nougat update and you are the extremely small % that falls victim.

I haven't been able to get WiFi calling to work on my Edge since new. UNTIL I upgraded to Nougat. Now it seems to be working fine. Go figure.

nosympathy said:
So question is, if you go somewhere with signal and wifi you can connect too, turn on airplane mode, leave it on and turn wifi on, does wifi calling work. If not then for sure a reset is in order.
If it does work, then that just tells me the phone isn't really turning everything off with airplane mode on (which is lame) and sprint just goofed up the nougat update and you are the extremely small % that falls victim.
Click to expand...
Click to collapse
Okay some interesting data. I did exactly this experiment this morning. I drove into my office, connected up to the office WiFi and placed my phone into airplane mode. I then turned on WiFi and WiFi calling. Voila I could make a WiFi call!
However I did not stop there. One of the keys to all this is that the one tower happens to cause "roaming" if my phone was lucky enough to connect to it. So for grins I changed the network mode from automatic to LTE/CDMA (Sprint & Verizon are CDMA). When I was back at the house guess what... WiFi calling now works. Interestingly the phone is in "searching for service" mode which implies that the one cell tower seen from my house is either AT&T or T-Mobile which use GSM. By turning off automatic mode everything worked.
It is kind of a bummer but what seems to fix the issue is to choose Connections->Mobile networks->Network mode->LTE/CDMA. Each time a switch is made from Connections->Mobile networks->Network mode->Automatic back to Connections->Mobile networks->Network mode->LTE/CDMA, etc. the phone has to be rebooted. Unfortunately while traveling in a car Automatic mode is desired and at the house LTE/CDMA is best. Switching back and forth will be a PITA because of the reboot but at least I don't have to go back to the Airave.
I tried to explain this to the Sprint rep. on the phone this evening but he did not understand. Over the weekend I might try a clean install via Odin and see if that improves things. I hate doing that because it takes a fair amount of time to put the phone apps back together. I also have my doubts it will fix anything. IMO something broke with the Nougat upgrade and nothing I do will fix it. And as you point out, I am in that very tiny percentage of people who might actually experience an issue.

Paul Ganci said:
Okay some interesting data. I did exactly this experiment this morning. I drove into my office, connected up to the office WiFi and placed my phone into airplane mode. I then turned on WiFi and WiFi calling. Voila I could make a WiFi call!
However I did not stop there. One of the keys to all this is that the one tower happens to cause "roaming" if my phone was lucky enough to connect to it. So for grins I changed the network mode from automatic to LTE/CDMA (Sprint & Verizon are CDMA). When I was back at the house guess what... WiFi calling now works. Interestingly the phone is in "searching for service" mode which implies that the one cell tower seen from my house is either AT&T or T-Mobile which use GSM. By turning off automatic mode everything worked.
It is kind of a bummer but what seems to fix the issue is to choose Connections->Mobile networks->Network mode->LTE/CDMA. Each time a switch is made from Connections->Mobile networks->Network mode->Automatic back to Connections->Mobile networks->Network mode->LTE/CDMA, etc. the phone has to be rebooted. Unfortunately while traveling in a car Automatic mode is desired and at the house LTE/CDMA is best. Switching back and forth will be a PITA because of the reboot but at least I don't have to go back to the Airave.
I tried to explain this to the Sprint rep. on the phone this evening but he did not understand. Over the weekend I might try a clean install via Odin and see if that improves things. I hate doing that because it takes a fair amount of time to put the phone apps back together. I also have my doubts it will fix anything. IMO something broke with the Nougat upgrade and nothing I do will fix it. And as you point out, I am in that very tiny percentage of people who might actually experience an issue.
Click to expand...
Click to collapse
Just out of curiosity have you tried turning your roaming off? Or adjust the settings to not connect?
Sent from Uranus, the only planet with a ring on the inside

izzibew26 said:
Just out of curiosity have you tried turning your roaming off? Or adjust the settings to not connect?
Sent from Uranus, the only planet with a ring on the inside
Click to expand...
Click to collapse
Thanks for the idea.
So while my wife and I were having lunch in town this afternoon, I took our phones and toggled LTE/CDMA and Automatic modes. When we arrived at the house with the phones in Automatic mode WiFi calling worked. I think as long as the phones do not roam and connect to that GSM cell tower, WiFi calling seems to work. So I put both our phones into Home only mode (Settings->Connections->Mobile networks->Data roaming->Roaming network->Home only). So far so good. Both our phones have had WiFi calling activated now for several hours so I think the strategy works. Turning roaming on and off is not as painful as changing the network mode. Still the Nougat behavior is very different, I dare say, broken from Marshmallow behavior.

Paul Ganci said:
Thanks for the idea.
So while my wife and I were having lunch in town this afternoon, I took our phones and toggled LTE/CDMA and Automatic modes. When we arrived at the house with the phones in Automatic mode WiFi calling worked. I think as long as the phones do not roam and connect to that GSM cell tower, WiFi calling seems to work. So I put both our phones into Home only mode (Settings->Connections->Mobile networks->Data roaming->Roaming network->Home only). So far so good. Both our phones have had WiFi calling activated now for several hours so I think the strategy works. Turning roaming on and off is not as painful as changing the network mode. Still the Nougat behavior is very different, I dare say, broken from Marshmallow behavior.
Click to expand...
Click to collapse
It's weird and I would bet money something they accidentally broke and such odd and perfect conditions have to be met to make it present itself, they probably had no idea. The sad thing is, this bug probably affects so few people, and most will probably not be tech people and will just get frustrated and switch carriers, and so the bug probably won't ever get fixed, except by accident possibly.

On a side note have you tried changing your location settings to GPS only. If you have it set for a method that looks for towers that might be the issue right there. GPS-LOCATING METHOD-DEVICE ONLY.
Sent from Uranus, the only planet with a ring on the inside

Greyed out apn settings
Need help I rooted my s7 edge sm-g935p sprint it is updated to the latest update and I have my msl code but can not access my apn settings they are greyed out even if I dial data and try to access it that way please help

..

izzibew26 said:
Wrong thread. Right section, wrong thread. There are 2 ways. I'm assuming you're attempting hotspot bypass
Sent from Uranus, the only planet with a ring on the inside
Click to expand...
Click to collapse
Sorry about that can you hook me up with the thread
YES I am trying to bypass have wifi sharing app but tends to make the rooted phone lag

...

I just tried the experiment. That did not work and in fact broke WiFi calling. So far the only solution is to toggle the LTE/CDMA and Automatic network modes where there is a Sprint tower preferably and then turn off roaming as I drive up to the house. Then WiFi calling works without issue. Nice thought though.
Sent from my SM-G935P using XDA-Developers Legacy app

Paul Ganci said:
I just tried the experiment. That did not work and in fact broke WiFi calling. So far the only solution is to toggle the LTE/CDMA and Automatic network modes where there is a Sprint tower preferably and then turn off roaming as I drive up to the house. Then WiFi calling works without issue. Nice thought though.
Sent from my SM-G935P using XDA-Developers Legacy app
Click to expand...
Click to collapse
Okay so things get even worse. Today I drove up to the house with roaming turned off and network mode automatic. After parking the car and walking to the end of the driveway to retrieve my garabage can, not only did WiFi calling fail to activate but I could not turn roaming back on. The Settings->Connections->Mobile networks->Data roaming->Roaming network menu is greyed out. IMO, Sprint has hosed up their edition of Nougat. So I will be left with a brick as a phone while I am up here at 8400' at my house. I am quite pissed.
FWIW, what I think happened is I walked to the end of my driveway and lost my WiFi connection. That caused WiFi calling to shut off and now it will not turn back on. At least if I could get roaming turned back on I could try and connect up to that one lonely GSM tower to possibly fix this issue. But I cannot even do that because the Roaming network menu is greyed out. I am going to have to drive into town just to fix this problem. Ugh!

Paul Ganci said:
Okay so things get even worse. Today I drove up to the house with roaming turned off and network mode automatic. After parking the car and walking to the end of the driveway to retrieve my garabage can, not only did WiFi calling fail to activate but I could not turn roaming back on. The Settings->Connections->Mobile networks->Data roaming->Roaming network menu is greyed out. IMO, Sprint has hosed up their edition of Nougat. So I will be left with a brick as a phone while I am up here at 8400' at my house. I am quite pissed.
FWIW, what I think happened is I walked to the end of my driveway and lost my WiFi connection. That caused WiFi calling to shut off and now it will not turn back on. At least if I could get roaming turned back on I could try and connect up to that one lonely GSM tower to possibly fix this issue. But I cannot even do that because the Roaming network menu is greyed out. I am going to have to drive into town just to fix this problem. Ugh!
Click to expand...
Click to collapse
try ##72786# in your dialer

Paul Ganci said:
Okay so things get even worse. Today I drove up to the house with roaming turned off and network mode automatic. After parking the car and walking to the end of the driveway to retrieve my garabage can, not only did WiFi calling fail to activate but I could not turn roaming back on. The Settings->Connections->Mobile networks->Data roaming->Roaming network menu is greyed out. IMO, Sprint has hosed up their edition of Nougat. So I will be left with a brick as a phone while I am up here at 8400' at my house. I am quite pissed.
FWIW, what I think happened is I walked to the end of my driveway and lost my WiFi connection. That caused WiFi calling to shut off and now it will not turn back on. At least if I could get roaming turned back on I could try and connect up to that one lonely GSM tower to possibly fix this issue. But I cannot even do that because the Roaming network menu is greyed out. I am going to have to drive into town just to fix this problem. Ugh!
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Found the fix... Updated the PRL & Profile. I guess the phone lost its mind and could not find it once the WiFi was dropped.

Many retail mobiles have "Wifi Calling" function but not any menu entry to enable , The APP can check the hidden function and enable it if can use.
https://play.google.com/store/apps/details?id=com.widget7.wifi.calling