Completely disable network search? - Hero CDMA General

I'm going to be going overseas in a few weeks, and am planning on using my deactivated Hero (now using the Evo) as a GPS. However, is there a way to disable any kind of attempt at picking up cell towers? I feel like even though the phone is deactivated, and even with all data and roaming turned off, it will still be searching for networks, this draining the battery. Any suggestions?

Turn mobile network off and it won't be able to look for towers not to mention it would likely never find anything in most other countries... with the whole gsm thing that they do. It would still search, and drain battery but again mobile network off kills the radio.
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Yeah, what this dude said

d4vz said:
I'm going to be going overseas in a few weeks, and am planning on using my deactivated Hero (now using the Evo) as a GPS. However, is there a way to disable any kind of attempt at picking up cell towers? I feel like even though the phone is deactivated, and even with all data and roaming turned off, it will still be searching for networks, this draining the battery. Any suggestions?
Click to expand...
Click to collapse
you may want to read this thread
http://forum.xda-developers.com/showthread.php?t=649379&highlight=gps+Europe
EDIT: from what i've read any app would download the maps as needed? so if you don't have data then you don't have maps. plus the gps uses the network to cheat in getting a general location, then it uses the gps to pinpoint. i don't think this would work at all. unless you had CDMA network coverage or WIFI

Related

Wifi calling

Anyone try out wifi calling/messaging yet? I just sent an mms and the "G" appeared even though the cell signal is off and it's supposed to be through wifi. It took longer than when I'm on 3G too...
Sent from my T-Mobile G2 using XDA App
i think the mms goes through a diff system when get home ill try it
I believe MMS always goes through cellular data.
This is to prevent an exploit of sending free messages over Wi-fi
funkadesi said:
I believe MMS always goes through cellular data.
This is to prevent an exploit of sending free messages over Wi-fi
Click to expand...
Click to collapse
exactlly what he said lol
Ah great to know thanks
Sent from my T-Mobile G2 using XDA App
well since this thread IS called wifi calling... id like to post that it doesnt work for me OR my friend who also lives close to me and got the update...
first let me state that ive tried with root and with out root
im on unlimited everything plan
ive checkd my wifi and it works just fine
i have wpa-psk encryption on my wifi
and i CAN make calls on cellular network
so now thats out there first thing i get is a popup saying do you want to register?
if i click yes then it just closes and sends me to the home screen
i open it again and it says wifi calling: enabling, for like a minute or two then it says connection error W006.15 isp or T-mobile Network Error
any one else get that?
V1R3Z said:
well since this thread IS called wifi calling... id like to post that it doesnt work for me OR my friend who also lives close to me and got the update...
first let me state that ive tried with root and with out root
im on unlimited everything plan
ive checkd my wifi and it works just fine
i have wpa-psk encryption on my wifi
and i CAN make calls on cellular network
so now thats out there first thing i get is a popup saying do you want to register?
if i click yes then it just closes and sends me to the home screen
i open it again and it says wifi calling: enabling, for like a minute or two then it says connection error W006.15 isp or T-mobile Network Error
any one else get that?
Click to expand...
Click to collapse
Something came up for crackberry users that stopped them from using UMA and since WIFI calling hits the same servers as UMA, i.e... they are the same thing, I suspect that your issue might be the same as what they were having. Your ISP's DNS is blocking the service. If you can change your DNS settings to OpenDNS.com and give it another try. This may not fix your issue, but I know it did for a whole lot of crackberry users.
V1R3Z said:
well since this thread IS called wifi calling... id like to post that it doesnt work for me OR my friend who also lives close to me and got the update...
first let me state that ive tried with root and with out root
im on unlimited everything plan
ive checkd my wifi and it works just fine
i have wpa-psk encryption on my wifi
and i CAN make calls on cellular network
so now thats out there first thing i get is a popup saying do you want to register?
if i click yes then it just closes and sends me to the home screen
i open it again and it says wifi calling: enabling, for like a minute or two then it says connection error W006.15 isp or T-mobile Network Error
any one else get that?
Click to expand...
Click to collapse
I get the same error message. Just got off the phone with a tmo rep and she said that there's a signal outage(?) around Atlanta and that's why I can't get ANY cellular connection whatsoever. But I remain skeptical, as my friends on TMO are having no problems and the "outage" just so happened to affect me right after the OTA was installed. My fingers are crossed that everything gets fixed though.
Mines works fine, it depends on what kind of network your on. On my campus it would not work, but when I got to my gf apt it worked perfectly. So check the wifi settings that you haveto make sure there isn't a firewall or something else set up.
Sent from my T-Mobile G2 using XDA App
Mine works on my college campus great. I have terrible coverage here. This may be a stupid question but, it only uses minutes when I'm actually calling someone right? Not however long it is enabled? I'm only asking because I'm tired of getting screwed over in ways that I logically shouldn't be.
Yea it only uses minutes when you are calling. Also I don't know what college you go but I go to umiami, so our networks are really strict with regard to using them for gaming or any kind of tethering. So I'm guessing they haven't allowed us access to do that here. But on any other networks like a home network it works perfect.
Sent from my T-Mobile G2 using XDA App
I go to Westfield State in MA. I had to get my phone registered on the resnet net work to use the wifi. Can you use wifi at all at school with your phone?
Sent from my T-Mobile G2 using XDA App
Crap. I just sorted out my issues with things draining the battery and now Wifi calling is running rampant. It stays running in the foreground even when it is turned off and logcat shows that it is constantly active even when the phone is asleep. Is anyone else seeing anything like this?
well i would like to know why its wifi calling if tmobile still use the mins from your plan thats like stealling it helps tmo they use less data but still charge us for it
Yea genius on their part...even still its not like they're not doing anything. It its still being runs through their network just not through their towers.
Sent from my T-Mobile G2 using XDA App
JRG1392 said:
Yea genius on their part...even still its not like they're not doing anything. It its still being runs through their network just not through their towers.
Sent from my T-Mobile G2 using XDA App
Click to expand...
Click to collapse
yea, what he said. Cellular towers are like a gateway to the Tmobile internet. The still pay for all the fiber and backhaul that gets your calls and data where ever it is that you want them to go.
i just updated and i opened up wifi calling and configured it. i dont understand how its wifi calling when it still uses our minutes? whats the point of having it then? what benefit is there to having this app?
Yea we can but we are literally forced to just web browse lol
Sent from my T-Mobile G2 using XDA App
T-mobile has had the "charging for minutes via wifi" policy now for YEARS going back to the first Blackberrys that supported UMA. Minutes were deducted unless a customer paid for the @home service per month. You can complain all you want, but if you consider the other carriers and their options---T-Mobile does NOT charge for HSPA+ (4G) access while other carriers do, and some charge even if there isn't 4G in that city just based on the phone! Wifi calling can also prevent you from incurring roaming charges by allowing you to make calls from almost anywhere you can get wifi access a feature that other providers just don't have. T-Mobile gives more minutes for less money, offers more data download than other carriers, and offers some truly awesome features that others just can't compare to.
Although WiFi calling uses up our plans minutes, if we have unlimted weekend minutes, use it on the weekends, is it free or does it take away from the anytime minutes?

Web browsing/data while on a call

I can usually browse the web and use data while I'm on a phone call.
Tonight I tried it and had no data connection until disconnecting the voice call. Can anyone who has not installed the OTA verify that it is still working? Or anyone with the OTA? Maybe I'm just crazy and am remembering something that didn't happen? No, I'm sure I could do both before.
I would hate to lose it this feature.
Sent from my T-Mobile G2 using XDA App
Works for me.. I've heard people say this happend before the update too, but I've never had any issues with it. Best thing to do is call tmobile to help you. It might have something to do with a weak signal, or not enough signal to handle both at the same time.
Have you tried using wifi calling and then browse the web through your wifi? That would prove it was somehow related to network signal.
Sent from my T-Mobile G2 using XDA App
My net won't work on Edge during a call, and is kind of laggy on 3G.
Sent from my T-Mobile G(dos)
U can only use data and voice with 3g/4g.
Edge uses the same stream as voice so you cant do both on edga data.
But I always use data and voice, mainly when looking up addresses or phone numbers
Sent from my T-Mobile G2 using XDA App
So maybe it was because I was on an Edge only network at the time of the phone call? I'll have to experiment more. To tell the truth I hardly make any phone calls with my cell phone.
This was all during a 35 minute trip across town so it's hard to believe it's on Edge the entire time since I have really good H access around town.
I'll call T-Mobile soon if it doesn't fix itself.
I've also been using a SIM that came with my Sidekick which was two phones ago. Going to also ask them if I am on the best web plan.
Thanks for the help.
Bishybob said:
I can usually browse the web and use data while I'm on a phone call.
Tonight I tried it and had no data connection until disconnecting the voice call. Can anyone who has not installed the OTA verify that it is still working? Or anyone with the OTA? Maybe I'm just crazy and am remembering something that didn't happen? No, I'm sure I could do both before.
I would hate to lose it this feature.
Sent from my T-Mobile G2 using XDA App
Click to expand...
Click to collapse
I have noticed this problem on my HD2 for a while now. I am sitting on a nice 3G signal and the moment a voice call connects, my data connection dies. it does eventually drop to Edge or GPRS but bounces back the instant I'm off my call. it's really consistent as in the moment I connect, it goes.
I've seen this behavior on both my Windows and Android builds on my HD2.
I'm starting to think this is either a hardware issue or perhaps a greater T-Mobile one.
Any thoughts?
Bishybob said:
So maybe it was because I was on an Edge only network at the time of the phone call? I'll have to experiment more. To tell the truth I hardly make any phone calls with my cell phone.
This was all during a 35 minute trip across town so it's hard to believe it's on Edge the entire time since I have really good H access around town.
I'll call T-Mobile soon if it doesn't fix itself.
I've also been using a SIM that came with my Sidekick which was two phones ago. Going to also ask them if I am on the best web plan.
Thanks for the help.
Click to expand...
Click to collapse
*#*#4636#*#*
Phone information
WCDM ONLY
Change it back when done
Sent from my T-Mobile G2 using XDA App
it usally takes about 30 sec for me to recover data on my phone sometime on 3g even on my tp2
I'm pretty sure now it was because I was on Edge. I've been able to use web while talking just fine recently.

Atrix Loses Internet Connection With AT&T

I've had my Atrix for a couple of days now, and twice internet connection with AT&T just stops working.
Going into airplane mode and then back to normal still does not fix the issue. Wifi works, however this should not be the solution.
Besides AT&T Gimping our HSUPA speeds and not providing an app for the FM Radio, the loss of internet connectivity is pretty annoying.
So far the only way for me to resolve the issue is to shut down or restart the phone.
Has anyone else experienced this? I have not rooted my phone yet because I want to see how things work stock.
Any information would be appreciated.
Thanks!
I had this happen to me 3 times already..among all the issues i am seeing with this device.
You are correct, nothing helps but a reboot.
clubtech said:
I had this happen to me 3 times already..among all the issues i am seeing with this device.
You are correct, nothing helps but a reboot.
Click to expand...
Click to collapse
This is bad, what other issues are you having?
James62370 said:
This is bad, what other issues are you having?
Click to expand...
Click to collapse
Mu phone is randomly rebooting on me even straight after a factory reset. It is going to get exchanged tomorrow.
Sent from my MB860 using XDA App
My phone just lost its connection and had to reboot. This happened after I disconnected from my vpn. Have to try to replicate the issue. Will keep you posted.
James62370 said:
I've had my Atrix for a couple of days now, and twice internet connection with AT&T just stops working.
Going into airplane mode and then back to normal still does not fix the issue. Wifi works, however this should not be the solution.
Besides AT&T Gimping our HSUPA speeds and not providing an app for the FM Radio, the loss of internet connectivity is pretty annoying.
So far the only way for me to resolve the issue is to shut down or restart the phone.
Has anyone else experienced this? I have not rooted my phone yet because I want to see how things work stock.
Any information would be appreciated.
Thanks!
Click to expand...
Click to collapse
Gimping the HSUPA is...but how are not providing an FM radio app and the connectivity problem you're having AT&T's fault? Nobody else seems to be having a problem losing connection (meaning it's either you or your device that's gone bad) and the FM Radio not having an associated app is Motorola's fault.
Assign blame where it's due, plz.
hotleadsingerguy said:
Gimping the HSUPA is...but how are not providing an FM radio app and the connectivity problem you're having AT&T's fault? Nobody else seems to be having a problem losing connection (meaning it's either you or your device that's gone bad) and the FM Radio not having an associated app is Motorola's fault.
Assign blame where it's due, plz.
Click to expand...
Click to collapse
Because AT&T is the APN providing internet access to our phones. Motorola has the FM hardware built in, AT&T is not making use of the FM Radio hardware which is already provided by Motorola.
If I was the only one with this problem, then others would not have stated they have the same issue.
So I blame AT&T when there is no connectivity on my phone because I'm paying them to be my service provider. AT&T also has restricted many features on phones which have applicable hardware.
Besides, you are not the authority as to who I wish to blame. If you don't have anything useful to post, then I suggest you just stay quiet since your reply is just wasting our time.
James62370 said:
I've had my Atrix for a couple of days now, and twice internet connection with AT&T just stops working.
Click to expand...
Click to collapse
This happend to my GF's Atrix last night on her way home from work. Said she rebooted it, and it still wouldn't connect. I rebooted it when she got home and it started working again.
I lost internet with mine last night. Had to reboot.
Sent from my MB860 using XDA App
Any chance this is related to not switching to the 4G data plans? Or has everyone done that?
AmesCell said:
Any chance this is related to not switching to the 4G data plans? Or has everyone done that?
Click to expand...
Click to collapse
We switched the plan when we ordered the phone online.
Sent from my SAMSUNG-SGH-I897 using XDA App
Mine has done it several times. It seems to happen after the connection drops for a weak signal. Then for some reason never comes back on. It is not just my internet connection, it is my entire signal that never comes back. I can't make calls either.
Same here, several times... id expect a patch coming shortly to remedy some of this BS.
i think all of these network issues all arond may be due to a deadline att has not met and is severely late on its 4g. Its prob updating its system. Just speculation.
kgeissler said:
Mine has done it several times. It seems to happen after the connection drops for a weak signal. Then for some reason never comes back on. It is not just my internet connection, it is my entire signal that never comes back. I can't make calls either.
Click to expand...
Click to collapse
I think you have this spot on
Sent from my MB860 using XDA App
I'm new to AT&T with this phone... hopefully they put me on the right plan.
this happened to me about 2 hours after I got the phone, once yesterday and once already this morning.
only a reboot fixes it. very annoying.
Is there anything I can post up to help devs figure this one out?
kgeissler said:
Mine has done it several times. It seems to happen after the connection drops for a weak signal. Then for some reason never comes back on. It is not just my internet connection, it is my entire signal that never comes back. I can't make calls either.
Click to expand...
Click to collapse
I didn't check my phone status, next time it happens I'll try to make/receive a call to confirm.
I had the same problem today. I turned my wifi on because I was home and then I wanted to test my 3G speed at home. Turned wifi off and then I lost the data connection. It showed the H+ symbol and full bars but not the arrows below the H. I had to reboot the phone to fix the problem. Airplane mode didn't help.
mgymnop said:
I had the same problem today. I turned my wifi on because I was home and then I wanted to test my 3G speed at home. Turned wifi off and then I lost the data connection. It showed the H+ symbol and full bars but not the arrows below the H. I had to reboot the phone to fix the problem. Airplane mode didn't help.
Click to expand...
Click to collapse
Did you bother to get an ATT 4g sim?
I hear that using a 3g sim will screw stuff up.
Techcruncher said:
Did you bother to get an ATT 4g sim?
I hear that using a 3g sim will screw stuff up.
Click to expand...
Click to collapse
I am new to AT&T and I guess I got a new 4G sim card. At least I had not an old one from another phone. Is there a possibility to distinguish them for me?

Massively increased battery duration

I'm guessing a lot of people on here know this already but I recently discovered how to massively increase my Moto X's battery duration. Namely by switching off Mobile Data, I can then go a full 14 hours only dropping down to around 75% by the end. So now as soon as I get into work or any place where I'm on Wifi I switch off mobile data.
Makes me wonder why having mobile data switched on is expending so much battery power?
If you wanna increase that even further, just turn the whole thing off. The battery will last for weeks.
teh_lorax said:
If you wanna increase that even further, just turn the whole thing off. The battery will last for weeks.
Click to expand...
Click to collapse
He actually has a point, there's no point on being sarcastic over a good advice that should be logical by now.
rogeriorp said:
He actually has a point, there's no point on being sarcastic over a good advice that should be logical by now.
Click to expand...
Click to collapse
Yes, turning off (necessary) features saves battery. This is not shocking.
teh_lorax said:
Yes, turning off (necessary) features saves battery. This is not shocking.
Click to expand...
Click to collapse
It is not shocking but somehow people tend to forget the basics. And it is also unnecessary while on wifi, which is the case and the advice he spoke of.
And I'd go even further and set 3G only with wifi, lollipop tends to switch from wifi to LTE by itself very often.
I've heard of people suggesting switching off wifi when your not using it, but never mobile data. So i just thought it might be a suggestion some people might appreciate. Take it or leave it.
Plus wifi is doing the exact same funtion as mobile data when your connected to it, so your not losing any functionality.
If your rooted you can even get Tasker to do the switch automatically.
This actually doesn't work. The data radio goes I to sleep mode when WiFi is on. Its not just doing its own thing while wood is on.
Definitely working on WiFi enhances battery life enormously but didn't try switching off mobile data
Zammo76 said:
I'm guessing a lot of people on here know this already but I recently discovered how to massively increase my Moto X's battery duration. Namely by switching off Mobile Data, I can then go a full 14 hours only dropping down to around 75% by the end. So now as soon as I get into work or any place where I'm on Wifi I switch off mobile data.
Makes me wonder why having mobile data switched on is expending so much battery power?
Click to expand...
Click to collapse
How is this possible? When your wifi radio is connected, the data side is completely disconnected. This is even reported in your 'status'.
I see your point, but all I know is that it definitely is making a large difference for me.
One theory I attributed it with was that with Wifi and Mobile Data switched on the phone is getting a lot more Wake Locks (perhaps doubling up), which in turn could also possibly be preventing the phone going into a Deep Sleep. But as the Wakelock detector app doesn't work any more (unless your rooted), I can't verify this.
Gonna test this out!
The issue with turning off mobile data is that it will cause problems with sending and receiving MMS, you may also have problems with SMS as well.
My HTC Sensation was really good at basically putting the radio to sleep when on Wifi and only waking when needing to send or receive data that will only work over the cell network.
Zammo76 said:
I'm guessing a lot of people on here know this already but I recently discovered how to massively increase my Moto X's battery duration. Namely by switching off Mobile Data, I can then go a full 14 hours only dropping down to around 75% by the end. So now as soon as I get into work or any place where I'm on Wifi I switch off mobile data.
Makes me wonder why having mobile data switched on is expending so much battery power?
Click to expand...
Click to collapse
I don't disable mobile data, but I do use tasker to switch to 3G when I'm connected to wifi. The LTE radio uses a lot more battery in poor signal areas (like my apartment) and I have noticed it helps me go from about 3 hours of screen time to 4.5. I think the MMS issues are a good point and I feel like this solution is slightly more elegant because even with mobile data disabled, the phone is still holding an LTE signal. Ymmv, obviously
mrapp said:
I don't disable mobile data, but I do use tasker to switch to 3G when I'm connected to wifi. The LTE radio uses a lot more battery in poor signal areas (like my apartment) and I have noticed it helps me go from about 3 hours of screen time to 4.5. I think the MMS issues are a good point and I feel like this solution is slightly more elegant because even with mobile data disabled, the phone is still holding an LTE signal. Ymmv, obviously
Click to expand...
Click to collapse
Hi can you explain whats the settings on tasker to do such a thing? Ive never used it but I have heard good things and just bought the app!
unk3 said:
Hi can you explain whats the settings on tasker to do such a thing? Ive never used it but I have heard good things and just bought the app!
Click to expand...
Click to collapse
First you'll need root and this plugin (make sure to enable external access in the plugin app)
Basically, create a profile that runs whenever you connect to a network (you can leave it blank for all networks or press the search button to choose just your home network).
The entry task would basically wait 10 seconds and then run the plugin choosing wcdma/gsm (auto) as the network mode. Choose then to add an exit task which simply recalls the plugin and chooses the network mode as LTE, wcdma, gsm. You can even add an extra step to each task at the end which has tasker display a toast that you can have say LTE enabled or 3g mode only
BrokenWall said:
The issue with turning off mobile data is that it will cause problems with sending and receiving MMS, you may also have problems with SMS as well.
My HTC Sensation was really good at basically putting the radio to sleep when on Wifi and only waking when needing to send or receive data that will only work over the cell network.
Click to expand...
Click to collapse
SMS/MMS are sent via voice channels, not data.
floepie said:
SMS/MMS are sent via voice channels, not data.
Click to expand...
Click to collapse
SMS is sent over Voice channels. MMS still requires data.
I double checked and tested this on my Pure Edition on T-Mobile.
Disabled Wifi and Cellular Data
Sent a standard text message, it was received by the other party. Attempted to send a photo message, it was not able to send from my phone as well as the other party did not receive it. Though it did resend when data was enabled.
Tasker can't turn off mobile data since Lollipop update....
Any sugestions?
BrokenWall said:
SMS is sent over Voice channels. MMS still requires data.
I double checked and tested this on my Pure Edition on T-Mobile.
Disabled Wifi and Cellular Data
Sent a standard text message, it was received by the other party. Attempted to send a photo message, it was not able to send from my phone as well as the other party did not receive it. Though it did resend when data was enabled.
Click to expand...
Click to collapse
No one sends MMS messages now (apart from old people), since the advent of Whats app and the like, so its hardly a deal breaker.
Zammo76 said:
No one sends MMS messages now (apart from old people), since the advent of Whats app and the like, so its hardly a deal breaker.
Click to expand...
Click to collapse
Troll alert

Mobile data not going inactive when wi-fi connects?

So when I first got my V20 (VS996), when wifi was connected the mobile data went inactive- at least I'm presuming so, the '4G' was grayed out, not crossed out, and when there's simply no 4G signal it entirely disappears (or drops to 3G etc). But now it ALMOST never does this anymore... every once in a while it will, but there's nothing specific about times it does.
I'm pretty sure that's what it's supposed to be doing, as there's even an option 'Cellular data always active - Always keep mobile data active, even when Wi-Fi is active [...]' (not enabled). I've searched high and low for a setting that could be causing it not to work right, and information about this, but have come up dry. Is anyone familiar with this? Really didn't want to have to reset and track it that way.
Thanks.
Bad WiFi signal bro. Disable your gsm data and see if you can still watch YouTube.
Sent from my LG-H990 using XDA-Developers Legacy app
fafalone said:
So when I first got my V20 (VS996), when wifi was connected the mobile data went inactive- at least I'm presuming so, the '4G' was grayed out, not crossed out, and when there's simply no 4G signal it entirely disappears (or drops to 3G etc). But now it ALMOST never does this anymore... every once in a while it will, but there's nothing specific about times it does.
I'm pretty sure that's what it's supposed to be doing, as there's even an option 'Cellular data always active - Always keep mobile data active, even when Wi-Fi is active [...]' (not enabled). I've searched high and low for a setting that could be causing it not to work right, and information about this, but have come up dry. Is anyone familiar with this? Really didn't want to have to reset and track it that way.
Thanks.
Click to expand...
Click to collapse
developer options
keep mobile data always on
as well as agressive wifi to cellular handoff
as well as under advanced for wifi, you can tell it to switch more agressively off wifi under poor conditions etc
somemadcaaant said:
Bad WiFi signal bro. Disable your gsm data and see if you can still watch YouTube.
Sent from my LG-H990 using XDA-Developers Legacy app
Click to expand...
Click to collapse
Bad WiFi doesn't seem to be the issue. It's showing max strength and is 2 feet away from the wireless router under my desk, and the issue still persists. (yes, youtube plays fine in HD)
Team DevDigitel said:
developer options
keep mobile data always on
as well as agressive wifi to cellular handoff
as well as under advanced for wifi, you can tell it to switch more agressively off wifi under poor conditions etc
Click to expand...
Click to collapse
I'm trying to get it to turn mobile data off, not hand off to it even easier. Are you saying that these options will make it disable mobile data when wifi is good, when it's not even doing that without them? Tried that just in case, it's still not deactivating mobile data (still at my desk, wifi router for 100mbps symmetric fiber showing full strength 2' away, so unlikely bad signal)
Edit: I may have found the issue. It appears one of the Verizon apps was forcing the cell connection to stay alive. I tried killing a bunch of the ones I wasn't using after recalling how their voicemail app only runs over cellular, and now mobile data is deactivated. I'll need more trial and error to confirm which one was doing it.. I killed 4 of them.. and it stayed off after re-launch so was clearly some kind of bug. Although it's odd as it did persist through reboots.
Edit: Confirmed; it's the 'Caller Name ID' app. Ending that single process restores the normal mobile data deactivation when wi-fi is good.
So another cause of this problem has popped up. After a reboot, 4G was becoming active after 15-30 minutes despite not touching the phone at all since the reboot, and there were no apps that could be killed to get it to switch off this time. But after a lot of trial and error, the cause was finally isolated: The My Verizon data meter widget. Once it refreshes, it forces cellular data to stay on, even when Wi-Fi is connected and strong. Once the widget was removed from the home screen, 4G never came back on while using WiFi.
Is there any way to disallow an app from using 4G but still allow it to use WiFi? I really would like a better solution than just not being able to use the widget. It would be fine if it just connected, got its update, then disconnected... but no, it's on permanently after a refresh.

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