Database Users

[Q] Losing data connection when switching between Wi-Fi and Cellular Data

Hi All,
Long time follower, first time poster..
I have a very annoying issue with my Nexus 4(4.2.1 and rooted on Tmob).
I use wi-fi connection at home and work and in-between I switch to HSPA or should I say, I was able to..
Lately I have been seeing that If I leave the Wi-Fi area, the phone doesn't switch to cellular data and the connection gets lost.
Switching to airplane mode and back brings it back most of the time but it's really annoying having to do so..
I did find an issue #40514 on the google android code page( code.google.com/p/android/issues/detail?id=40514)
Tried the suggested work arounds like "Auto Network" setting and it didn't seem to help..also have tmob in the APN settings. Still the only thing that works for me is toggling the airplane mode.
This happened to me once on my previous Gnex but with N4, it started to happen all the time.
Does anyone have a better solution to this issue?
Thanks
Oz

even I face the same issue with this new Paranoid 4.1.2 ROM for Atrix 2. I've noticed only one ROM gave me consistent data 24/7, it was from same dev altered his NUMA B2.
But other than that, this has been a repeating problem in all ROMS. Data stays on for hours without issue but suddenly drops and never comes up, other than air plane toggle. Somebody mentioned it is with the network and trust me it is not..
but I'm also eagerly waiting for a solution

krisxda said:
even I face the same issue with this new Paranoid 4.1.2 ROM for Atrix 2. I've noticed only one ROM gave me consistent data 24/7, it was from same dev altered his NUMA B2.
But other than that, this has been a repeating problem in all ROMS. Data stays on for hours without issue but suddenly drops and never comes up, other than air plane toggle. Somebody mentioned it is with the network and trust me it is not..
but I'm also eagerly waiting for a solution
Click to expand...
Click to collapse
Yea, at first I thought it has something to do with rooting but apparently it is happening with non-rooted phones as well..Google needs to address this issue..

ozgurust said:
Yea, at first I thought it has something to do with rooting but apparently it is happening with non-rooted phones as well..Google needs to address this issue..
Click to expand...
Click to collapse
Are google aware of this wireless connectivity issue? I've posted and started another thread which details a 3G data issue... :/

LPX4 said:
Are google aware of this wireless connectivity issue? I've posted and started another thread which details a 3G data issue... :/
Click to expand...
Click to collapse
Just throwing in my two cents; I starred the threads that I *think* are related on the google tracker. My experience is like this:
I start up Sirius on my phone before leaving home (On wifi)
Driving to the end of my development and then lose WIFI which in turn turns my 3g/4g gray for about a half mile
Picks 3g/4g back up eventually
As I'm driving to work if I end up picking up any open WIFI spots that have a login, once that happens I lose 3g/4g again then have to either wait till that access point is out of range or just turn off my WIFI before data will pick up again
It's pretty annoying; probably going to have to create a tasker profile to turn off wifi when leaving the house and back on when I get home.

Same problem on an LG F6 Optimus
I just got a brand new LG Optimus F6 and I'm noticing this same issue. The phone is stock and runs 4.1.2
Anyone found a solution?

the issue continue in n4 with 4.4?

[Q] T Mobile 3g Random Data Drop

Hi,
So i own a nexus 7 3g and use the t-mobile data service and i am hoping you guys can help me with these random data drops i get.
I will bring my tablet to work, put it in my book bag and drive to work, and when i get to work, the data signal is gone and its disconnected from t-mobile.
The only way i know how to get data back is restarting the tablet.
I was hoping there might be another way to get data back without rebooting, or find a way for this to stop happening altogether so i dont lose data randomly like this while i travel or leave the device unattended for a few hours.
I have never owned any GSM devices besides the nexus 7 so i am not to familiar with troubleshooting or any little tinkering i need to do with a GSM device/sim card etc.
So any ideas/help will be awesome and gratefully appreciated.
Thanks in advance.

Pithism said:
Hi,
So i own a nexus 7 3g and use the t-mobile data service and i am hoping you guys can help me with these random data drops i get.
I will bring my tablet to work, put it in my book bag and drive to work, and when i get to work, the data signal is gone and its disconnected from t-mobile.
The only way i know how to get data back is restarting the tablet.
I was hoping there might be another way to get data back without rebooting, or find a way for this to stop happening altogether so i dont lose data randomly like this while i travel or leave the device unattended for a few hours.
I have never owned any GSM devices besides the nexus 7 so i am not to familiar with troubleshooting or any little tinkering i need to do with a GSM device/sim card etc.
So any ideas/help will be awesome and gratefully appreciated.
Thanks in advance.
Click to expand...
Click to collapse
There maybe problem because of apps like juicedefender which disables network in ideal/sleep mode ,So unistalling such apps may help you , BTW Are you sure network is not an issue ? Because even i have 3G Nexus 7 , i am also facing connection issue, My networks disables automaticaly anytime, when i use Wifi it disables my Sim network connection, It means i cant use internet without wifi though its 3G model I have reported the same to my nearest Asus service centre they looking on it , They told me there will be setting for data dropping , If i able to find its solution then will PM you.

H4CK_H0PP3R said:
There maybe problem because of apps like juicedefender which disables network in ideal/sleep mode ,So unistalling such apps may help you , BTW Are you sure network is not an issue ? Because even i have 3G Nexus 7 , i am also facing connection issue, My networks disables automaticaly anytime, when i use Wifi it disables my Sim network connection, It means i cant use internet without wifi though its 3G model I have reported the same to my nearest Asus service centre they looking on it , They told me there will be setting for data dropping , If i able to find its solution then will PM you.
Click to expand...
Click to collapse
Hi
Thanks for the helpful tips. I'm pretty sure i don't have any battery saving apps, i deleted the few i did have.
I don't have any network issues. It seems it only turns off when in traveling around with it. Its really weird, and i am confused as to why it just goes away only when im traveling with it.
It does get disconnected from the internet when on wifi at home and stuff, but i still have bars in the signal icons moving and showing me that i am connected to t-mobile service.
But when i am dealing with this issues and have no data, the icon is empty and it tells me i have no service.
Maybe just toggling airplane mode might work, ill try that next time.

i tried toggleing airplane mode, no luck.
It may be the connection, but is frustrating i have to reboot every time just to get data back. Even if i toggle data in mobile data it wont work.

"Ready to connect when network quality improves"

Hi guys,
Getting this message upon connevting to virtually every wireless network sinse rootibg my phone, is there a root tweak to disable betwork quality checking ? On a G900F
Thanks

Anyone?

You should be able to turn off smart network switching under wifi settings that will solve it.

Nice one thank you! I will see what happens!

turning off smart networks helps, but if the wifi signal is too poor it will not connect anyway

qrono said:
turning off smart networks helps, but if the wifi signal is too poor it will not connect anyway
Click to expand...
Click to collapse
u cannot change that.

ready to connect when network quality improves
We have two Galaxy 5s in our home (AT&T and T-Mobile). Both just started getting this message last night. "ready to connect when network quality improves"
Its multiple access points, multiple networks. Eating battery like crazy. Dropping and reestablishing connections to WiFi every 15 to 60 seconds.
Pain in the @zz

Turn off "smart network switch"
I also started getting "ready to connect when network quality improves" messages constantly as the network connected and disconnected. Turning off the "smart network switch" option fixed the problem. I also leave the annoying Samsung Connections Optimizer turned off.

Smart Network Switch Off?
I just got my S5 about 6 weeks ago. I have had NO issues until this week. A few days ago, even though wifi notifications were turned OFF - I kept getting this "connected to network name" message on the bottom of my phone. When I went into wifi settings this morning, I noticed it would switch from connected (very strong signal strength) to "waiting for signal quality to improve". It constantly goes back and forth - 5 seconds or so on each. This is not an issue on any other device connected to the wifi router at my home and I just tried it at work - happens here too.
I checked to make sure wifi notifications were off - they were - but the pop up still appears over and over. I think that's another issue separate from this because if notifications are off you should not be getting any!
I have done as suggested here and turned off the smart network switch, however, does that now mean that I will be switched back and forth every 5 seconds from data to wifi? That defeats the purpose of connecting to wifi to save on monthly data plan charges.
AFTER noticing this problem this morning, I went to see if there were any software updates - there were (Lollipop). I did download that, but no change.
How does turning this off affect where my phone pulls from? Uses data or wifi?
Thanks for any help!

Mizz_J said:
I just got my S5 about 6 weeks ago. I have had NO issues until this week. A few days ago, even though wifi notifications were turned OFF - I kept getting this "connected to network name" message on the bottom of my phone. When I went into wifi settings this morning, I noticed it would switch from connected (very strong signal strength) to "waiting for signal quality to improve". It constantly goes back and forth - 5 seconds or so on each. This is not an issue on any other device connected to the wifi router at my home and I just tried it at work - happens here too.
I checked to make sure wifi notifications were off - they were - but the pop up still appears over and over. I think that's another issue separate from this because if notifications are off you should not be getting any!
I have done as suggested here and turned off the smart network switch, however, does that now mean that I will be switched back and forth every 5 seconds from data to wifi? That defeats the purpose of connecting to wifi to save on monthly data plan charges.
AFTER noticing this problem this morning, I went to see if there were any software updates - there were (Lollipop). I did download that, but no change.
How does turning this off affect where my phone pulls from? Uses data or wifi?
Thanks for any help!
Click to expand...
Click to collapse
+1 with exact same timelines/symptoms and upgraded to Lollipop and no diff too.

I started getting this message on my S5 last night! The connection will hold for about 10-15 seconds before reverting to LTE.
Tried resetting router settings, playing with different wireless settings - changing channel width and turning the visibility on and off.
Then "forgot" the network and readded it again.
It seems to be holding a stable connection without it dropping and was able to download a few items from the play store without dropping.
Will update if it changes.

Same here S5 900F
jsobey said:
+1 with exact same timelines/symptoms and upgraded to Lollipop and no diff too.
Click to expand...
Click to collapse
Exactly the same issue / model / timing / battery issue !
Is there a bomb timer on that mobile ?

jsobey said:
+1 with exact same timelines/symptoms and upgraded to Lollipop and no diff too.
Click to expand...
Click to collapse
Me too - I've been searching for weeks to figure this out - tried every known fix .... nothing has helped. I've even reset/changed/updated my wifi settings on my router. Nothing has helped. My S5 is the only one that has this problem. Other phones in the house have no problem - S4 and others.... I just don't know whats going on. I maxed my data avoiding this issue - but I really need a fix for it.

sport2237 said:
Me too - I've been searching for weeks to figure this out - tried every known fix .... nothing has helped. I've even reset/changed/updated my wifi settings on my router. Nothing has helped. My S5 is the only one that has this problem. Other phones in the house have no problem - S4 and others.... I just don't know whats going on. I maxed my data avoiding this issue - but I really need a fix for it.
Click to expand...
Click to collapse
This problem was driving me insane......I had it and managed to fix it (hopefully been going ok for three days now) I have a samsung Galaxy S5 on EE.....I backed everythingh up and did a factory data reset. Hope this helps.

I have a Galaxy S6 and have the exact same issue. I have called Samsung, my carrier (US Cellular), and tried a local place to get it fixed, but no one has ever heard of this issue. Amazon Photos was hogging a lot of bandwidth and backing up on wifi only so I stopped using that. Still not much of an effect. Using FB or a video is almost impossible because they won't load or refresh. I've tried all of the suggestions, but don't see a final fix. Can anyone help? This is my second S6 with the issue.

No data after having WiFi enabled for a while

Hello,
I've had this issue across more than 1 device and more than 1 carrier.
Here's what happens:
I enable WiFi, and for a while everything works as expected. I can send and receive MMS messages. I can disable WiFi and go back to my 4G connection.
The problem is, after an unknown amount of time, the phone drops the 4G connection in the background. I only know when I can't receive/send MMS messages anymore. At that point, if I disable WiFI there's no 4G data connection, and I have to turn Airplane mode off and turn it back on.
This is really annoying. It happened to me using Sprint and a Galaxy S4 (both stock and custom ROMs) and it's happening to me with a Galaxy S5 from MetroPCS. (I've used the stock Metro ROMs, Stock T-mobile ROMs, and Custom T-mobile ROMs).
Right now I'm using a Stock T-mobile ROM with the latest firmware, carrier is MetroPCS.
What can I do so this doesn't happen? It's really frustrating.
Thank you for your time.

Disabled "Smart Network Switch" in WiFi Settings?

*Detection* said:
Disabled "Smart Network Switch" in WiFi Settings?
Click to expand...
Click to collapse
Hello.
That's already disabled.
Should I enable it?

I tried with "smart network switch" enabled and disabled and problem still happened.

My S5 G900F Android 5.00 (Smart Network Switch disabled, Power Save disabled) on EE UK has had this problem for 9 months after phone upgraded itself to Lollipop (EE win the accolade to being the SLOWEST ON THE PLANET to provide Android updates.....). Since Jan 3, my wife's G901, a couple of weeks after it upgraded from 5.0 to 5.02, has developed the same problem. Neither phone has ever been rooted or other.
I have fruitlessly searched everywhere for a solution without success. EE Customer Services Tier 2 & Samsung's own service centre have failed to fix it. EE & Samsung blame each other for 5.1 or 5.1.1 not being available for download. Neither is prepared to resolve the issue despite hours on the phone. Have tried Safe Mode, Factory Reset, clearing everything, reloading APNs & Samsung even reloaded Android. All a waste of time: Many many days of it!
After approx half an hour connected to Wi-Fi, only way to get the mobile data to connect, is either reboot, enter & exit Air-plane mode or flip the 4G > 3G > 4G connection under More Networks. Have tested the fault in different cell areas countries and continents; fault is same everywhere.
It seems there are quite a few sufferers of this problem.

Samsung S5 keeps losing data connection
I have the same problem. My new Samsung phone loses the data connection (even though data is turned on) and I can only re-connect by restarting the phone. The first EE shop I took it to couldn't help at all. The second gave me a new SIM - that didn't work. Then I tried online support and after 3.5 hours of my life, in which I was passed on from one person to another, they completed a factory re-set - which didn't work (and additionally lost all the personalisation of my screen and some of my contacts). So I now have a not-very-smart phone which I have to re-start every time I want to use data. This is a business contract and the phone is less than two months old, but I'm not getting any effective support from EE. Android version is 5.0.2

me too, since last update. and app 'phono' shows "mobile data off" not got a time on it, but when i leave wifi coverage, it wont reconnect to cell data 2g/3g/4g. flightmode toggle to restore.

Abandon hope if you have this intermittent mobile data problem!
...at least until there is a software update, though I have no idea if that will help.
I have now tried a new sim card, a factory reset, and a replacement phone - which was provided only because I'm a business customer and I found a sympathetic member of staff. *By the way, I was told that if you are personal customer they won't consider replacing your phone if it is more than a month old - even if you started complaining about the phone as soon as you got it, the chances are a month will have elapsed by the time they put you through the hoops of a new sim, reset etc - and then it is too late to insist on a replacement phone.
In any case the replacement phone didn't resolve the issue so I have reached* a dead end. My phone fails to connect to data after having been connected to wifi - you have to do it manually each time you move away from a wifi connnection. At first I was doing it by restarting the phone, but am now following the advice of someone else who has the same problem and am going into flight mode and out again. *
This is not satisfactory, and it seems from reading forums that EE are to blame for the problem rather than Samsung, but I'm not 100% sure about that.*

Possible solution that works, for me, at the moment!
Having suffered this issue of my S5 (SM-G901F) not connecting to mobile data after being on Wi-Fi for a while unless switching airplane mode on/off for a few weeks; although it has probably been happening since the update I received late December; I have tried all of the turn this switch off, factory resets (x2), etc, etc, etc. and Googled the issue without success.
I have found this thread interesting, and I even tried calling EE support only to be told "you have tried everything that we would tell you to do" and "it wouldn't be a sim card, or handset issue, sounds like software". The reply was basically that like-it or lump it until the 5.1 update is released "by Samsung not EE because EE do not release Android updates". [Perhaps EE don't release the updates, but the stock rom is tested by them and their bloatware added before they eventually release it!!!]
Following my last reset I tried selectively re-installing the apps I used incase that was causing the issue. No Luck!
One last thing I tried was to look at every system 'thing' that I could find which used/switched any part of the mobile/mobile data/wifi - in addition to the settings I had already tried (all of which were mentioned in this thread previously). One thing I could not find not mentioned here, or anywhere, was the VoWi-Fi call on/off which I had always set to on as I do not live in a great reception area. Calling over Wi-Fi is great when you don't have a strong mobile signal.
Having 'played' with this setting for the last 24 hours I have found that the VoWi-Fi on/off appears to be a possible cure - for me anyway.:fingers-crossed:
When VoWi-Fi was set to off and leaving the phone connected to Wi-Fi overnight, the S5 immediately switched to mobile data this morning when I turned the Wi-Fi off . It continued to switch between Wi-Fi and mobile data all morning whilst out and about in and out of Wi-Fi connections - Woop Woop!!!
I then tried switching VoWi-Fi on (with Wi-Fi on and at home), leaving the phone for a number of hours, only to find that when I turned Wi-Fi off the phone refused to connect to mobile data even with a 'decent' mobile signal. The only way to get it to connect was to go back to switching Airplane mode on/off.
Switched VoWi-Fi off again, left Wi-Fi connected, left the phone for a couple of hours, etc. and hey-presto immediately switched to mobile data when I turned the Wi-Fi off. [Dances around the room because he's got the S5 automatically switching to mobile data again. Even though I'm at home with a great fibre internet and strong Wi-Fi connection!!!]
I do not know if this could be a solution for the others who are suffering from this issue, but it appears to be a solution for me at the moment. I thought I would share as your previous posts have helped me and you all seem to be pulling your hair out; like I have been; trying to find a solution.
Try it, it may work, but don't shoot me if it doesn't!

It's encouraging to know that I'm not crazy. I've had this issue across two devices and carries.
John,
Thank for your suggestion about WiFi calling. Unfortunately, I always have it off! I never used it, so maybe I should try turning it on? We'll see lol.
At this point, I think this is going to be my last Galaxy line phone.

Is it wi-fi calling that's causing the problem?
I have wondered if there is a link with wi-fi calling, but haven't tested it properly. I signed up with ee and bought the Galaxy phone specifically so that I could use wifi calling, as the town where I live (in the Scottish Borders) doesn't get a mobile signal strong to work reliably indoors from any of the networks. I'll try turning off wi-fi calling to see if that sorts the data thing (though I see that for one person above it did not). That would mean I wouldn't get calls or texts when I'm at home so it would not be a permanent solution for me. But in fact the wi-fi calling is not reliable anyway....

Brian_svc said:
It's encouraging to know that I'm not crazy. I've had this issue across two devices and carries.
John,
Thank for your suggestion about WiFi calling. Unfortunately, I always have it off! I never used it, so maybe I should try turning it on? We'll see lol.
At this point, I think this is going to be my last Galaxy line phone.
Click to expand...
Click to collapse
Brian,
You never know the way things are going with this issue; given that nobody seems to be able to pinpoint the fault; turning it on may just sort it!!!

still no change and its a pita.....

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.