Develop Bugs

No 3G signal after getting off Wifi

Just curious if this happened to anyone or is it just me: most of the time I'm connected to wifi to save battery (home, school, etc) and when I'm out of range it should automatically connect me to the 3g network but it's not. I check settings and 3g is still enabled. Anyone know why?

JBNAquatics said:
Just curious if this happened to anyone or is it just me: most of the time I'm connected to wifi to save battery (home, school, etc) and when I'm out of range it should automatically connect me to the 3g network but it's not. I check settings and 3g is still enabled. Anyone know why?
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I am also experiencing this. This happens to me when I am connected to WiFi with bad or no signal but then when I turn off WiFi and go to a good signal area it still registers no signal until I restart my phone then all is fine. Definitely a major bug.

ive had 2 of these phones, ive never had an issue with this. eh. maybe im lucky

Any solution to this?
Ever since I purchased this phone, I hardly get 3g signal. Will a hard reset fix this problem? I have to go by 4g or wi-fi on this phone for data.

JBNAquatics said:
Just curious if this happened to anyone or is it just me: most of the time I'm connected to wifi to save battery (home, school, etc) and when I'm out of range it should automatically connect me to the 3g network but it's not. I check settings and 3g is still enabled. Anyone know why?
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having wifi on will actually kill your battery more because you have another radio running, thats why they give you the option to turn it off. (to save battery)
hmm thats odd though mine turns back on just fine
try a hard reset.
its deff a software issue

dtr145r said:
having wifi on will actually kill your battery more because you have another radio running, thats why they give you the option to turn it off. (to save battery)
hmm thats odd though mine turns back on just fine
try a hard reset.
its deff a software issue
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Wrong, having wifi on saves power because than your phone doesn't have to ping and search for cell towers
Sent from my SPH-D710 using xda premium

csdalporto said:
Wrong, having wifi on saves power because than your phone doesn't have to ping and search for cell towers
Sent from my SPH-D710 using xda premium
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+1. Wifi Is definitelya battery saver. I leave wifi on all night at home. I get great battery life. I also never have the problem with 3g either. It always comes back even if I lose wifi signal.
The Evo3D Killer!!!

I noticed this in mine, so I went to Settings->Wireless and Network-> Mobile Network Data and then unchecked 3G and re-checked it and it hasn't had the problem since. Try it and report back.

a lot of users are having this issue along with low speed results on 3g, I read on another forum that Samsung/Sprint are working on it but I'd take that with a grain of salt. I fixed the radio wake up issue on my phone by doing factory reset and then going through the hands free activation again. Haven't had it since.

i'm having this issue too. Turning off wifi, or every time I go in an elevator and loose my 3g signal.
The strange thing though is I had this same problem with my OG Epic for the last two weeks I had it. I flashed back to the current Sprint rom and still had the problem. It was actually the reason I bought the Epic Touch on day 1.

I too am having 3G connection problems
My work is located a mile North of the 101 and Scottsdale and I can't get signal in my building, even if I walk to the big windows.
Of course Phoenix has no 4g so Im S.O.L.

Does WIFI use power if its not connected?

I See my wifi has used 30% of my battery but ive been on 3G all day, does it drain the battery searching for networks?

It does use some power when searching for networks. There is probably an APP or settings that you can change to set the Freq of checks maybe. Or you can just turn of the Wifi radio when you know your not going to use it.

DroidHam said:
I See my wifi has used 30% of my battery but ive been on 3G all day, does it drain the battery searching for networks?
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Yes it uses a lot of power if its regularly searching for networks. Especially if you're moving around and seeing dozens of WiFi spots. Just turn off WiFi when not in use, simple as that.

A lot of custom ROMs have less aggressive Wifi seeking intervals. You can usually set it manually with ease too. Lots of apps out there if you don't want to do it manually.

All that was said is true, but still I find that 30% usage for Wifi just for searching nearby networks is a little too much...
Although I haven't got anything to compare with, I always turn wifi off if I'm not using it during long periods.
Regards

I turn wifi off when it is not needed and battery life goes from one to two days.
Sent from my Galaxy Nexus using XDA App

I've been using Tasker to turn wifi on at home/work and off when I'm elsewhere. It's using cell towers to determine location, so hopefully it won't impact the battery much.

I leave wifi on 24/7, today it has used 2% of the 60% battery i've used.
I travel through london so I assume it is constantly finding new wifi signals.
Sent from Mobile..

Y5 Battery Saver .. on the market, free. Turns on/off Wifi based on known networks and cells in the area of the AP.

str355 said:
I leave wifi on 24/7, today it has used 2% of the 60% battery i've used.
I travel through london so I assume it is constantly finding new wifi signals.
Sent from Mobile..
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I leave wifi on all the time as well, and I also only have used 2% of the 70-80% battery I used up already.
Try going into wifi settings, then advanced wifi settings, then turn off the new wifi network available notification option.
This increased my battery life slightly.
Sent from my Galaxy Nexus using XDA App

Y5 - Battery Saver helps out tremendously! I barely ever use more than 2% when home all day...although that may be a bug but I started a thread for that already.

eddie_gordo said:
All that was said is true, but still I find that 30% usage for Wifi just for searching nearby networks is a little too much...
Regards
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Click to collapse
That 30% displayed can be deceptive since it's based on the amount of battery discharged and not entire battery capacity.

Well wifi, when on is looking to connect to known networks. If the signal is weak it will disconnect and connect to another network near by if there is that has better signal. This process does use some battery. The biggest drain will occur when you are actively using wifi, that is when you download or upload. So the best way to save battery, is to close wifi when not needed. If however you want wifi you can set it to never sleep. This way even if the screen goes off wifi will be connected and your device wont use the 3G which is way more power hungry.

App idea 2g when screen off

Does any sort of app exist? I'm rooted and for battery saving purposes, would it not be a good idea to switch to 2g automatically when the screen is off for more than a minute? Then when the phone is woken up switch back to 3g?
I'm not talking about turning data off completely as this would stop whatsapp messages coming through.
Sent from my HTC One X using xda app-developers app

kevz65 said:
Does any sort of app exist? I'm rooted and for battery saving purposes, would it not be a good idea to switch to 2g automatically when the screen is off for more than a minute? Then when the phone is woken up switch back to 3g?
I'm not talking about turning data off completely as this would stop whatsapp messages coming through.
Sent from my HTC One X using xda app-developers app
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Click to collapse
Dont know if it helps but I just made this post a few hours ago.
http://forum.xda-developers.com/showthread.php?t=1765911
Not sure if that's what you need though.
It uses mobile data though... For 2g and 3g I'll try to create a new app for that
But for now yeah that's what I have

Would Tasker not be able to do that?
(I've only used it a few times recently but sounds within its capabilities)

r2b2 said:
Would Tasker not be able to do that?
(I've only used it a few times recently but sounds within its capabilities)
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Click to collapse
It is built using tasker.

I tried to use Tasker for this but not sure how to configure it. Anyone successfully configure please share the steps..

yltan said:
I tried to use Tasker for this but not sure how to configure it. Anyone successfully configure please share the steps..
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if you turn off the 3g while the screen is off, you wont receive any emails is this correct?

2g... Data is data. Psst, you can watch Youtube without 3g!
Sent from my HTC One X using xda app-developers app

Hi
kevz65 said:
Does any sort of app exist? I'm rooted and for battery saving purposes, would it not be a good idea to switch to 2g automatically when the screen is off for more than a minute? Then when the phone is woken up switch back to 3g?
I'm not talking about turning data off completely as this would stop whatsapp messages coming through.
Sent from my HTC One X using xda app-developers app
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Click to collapse
It's not that simple and probably not worthwhile. 2G and 3G on standby are pretty close in terms of power usage, the only time you usually find an advantage with 2G is where the 3G signal is weaker, so less power is used keeping in touch with the 2G tower. If you fix the phone to 2G, you also save some power if moving around as the phone is only talking/listening to 2G cells, and less likely to be swapping about. When you have "auto" selected and you are moving around the phone has to monitor both 2G and 3G cells to be ready to make a handover decision, so that is extra power.
If you have the phone constantly dropping 2G to go to 3G when you turn on the screen, then back again, that all takes extra power to negotiate with the cells. Also if you get a phone call and the phone switches to 3G, this will drop all connections when the setting is changed, as you can only have a smooth handover when the phone is in "auto" mode and has already established a handover strategy.
Then you need to factor in data usage. When any applications sync while your phone is in standby (screen off) if on 2G that sync is going to take longer, and the longer it takes the longer your phone has to stay awake to wait for it to happen, and the radio is on longer transmitting, so more power is used than there might have been on 3G.
The net effect of such a setting is likely to use more power overall.
Regards
Phil

[Q] How to totally disable Cellular network ?

I have N7 LTE 4G and most of the time I use it with Wi-Fi only. Yesterday I decided to get a pre-paid Sim to use for Data only when I am in a place that doesn't have Wi-Fi with 1GB per month data for $2.90 (yes it is THAT cheap in Egypt ) but only 3G/HSDPA/HSPA+
Now the problem is, Cellular network is always running and battery drains fast even though I use the internet on Wi-Fi and turned Mobile Data off.
I've read that I can turn on 2G to save battery and disable the cellular signal and indeed when I check 2G, I get no bars in cellular top icon and it says No Service (Network Name) BUT..... as soon as I open internet browser or any internet app, the cellular network works again by itself although 2G is still checked !!
Is this some kind of bug ?
The only solution I can do is to turn on Airplane Mode and turn Wi-Fi on afterwards which is not ideal
Any help would be much appreciated.

There is an app called Battery Monitor Widget that has "Tests" tab when I press on it, it opens "Testing" page in which the first option is Tablet Info. There is a list called "GSM Only" in which there is a toggle to Turn Off Radio and indeed it turns it off

I use airplane mode then just turn wifi back on to keep the cellular radio off.
Sent from my Nexus 7 using XDA Premium HD app

Que_Ball said:
I use airplane mode then just turn wifi back on to keep the cellular radio off.
Sent from my Nexus 7 using XDA Premium HD app
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How much battery does this save ?

r9800pro said:
How much battery does this save ?
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It really depends on your signal strength. If you have strong signal you shouldn't see a huge difference. If you have a weak signal then it could be a big boost to your battery life.
And I'm not sure why you said that it was "not ideal" in your initial post. That's really the best way to go about it.

raptir said:
It really depends on your signal strength. If you have strong signal you shouldn't see a huge difference. If you have a weak signal then it could be a big boost to your battery life.
And I'm not sure why you said that it was "not ideal" in your initial post. That's really the best way to go about it.
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Click to collapse
Signal is always good but I don't even need it to be there when I am on Wi-Fi as the tablet has no GSM phone functionality.
I think there is something wrong elsewhere with the battery draining so fast other than the GSM Radio being On.
The battery was good and lasted 2 full days with moderate usage and Wi-Fi always On but it started draining fast when I left the tablet untill it totally discharged and woke up to find it powered off and then charged it till 100% and battery reached 55% in 10 hours with very light usage

It sounds like you have an app draining your battery in the background. Try installing Better Battery Stats and see what's using all your power.

raptir said:
It sounds like you have an app draining your battery in the background. Try installing Better Battery Stats and see what's using all your power.
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Is that the $2.76 app from Play store ?

r9800pro said:
Is that the $2.76 app from Play store ?
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Click to collapse
Yes, the developer also posts it here on XDA.
http://forum.xda-developers.com/showthread.php?t=1179809

[req] [setting] auto wifi off

something ive been noticing is that i get alot of battery drain from wifi. most of it comes from searching for wifi and i leave it on because periodically throughout a day im in and out of my saved network's range. Id like it there was a setting or a system edit that would turn off the wifi after searching for 5 minutes and not finding one. i'm assuming the drainage is coming from the the MIMO technology or something. anyways, if you have something it would be greatly appreciated. Thanks.

I am using Tasker for this, when I come home or office, mobile data switch off and wifi turns on

Do you need location on for this?

me myself and i said:
Do you need location on for this?
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either that, or something else like bluetooth. but location is preferred. I use MacroDroid, a Tasker alternative with a much better UI, and i can set the location update cycle to 10 mins or so to prevent battery drain

Or you can use the cell tower near you option in tasker.
Location/GPS uses battery as well so make use of what is already being used for calls & sms

chazarss said:
I am using Tasker for this, when I come home or office, mobile data switch off and wifi turns on
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How? Please explain?

ELoTRIX said:
How? Please explain?
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Search Tasker app for rooted phones, you can do unlimited settings with tasker. I have set my tasker to find cell tower near my home, when my phone receive signal from that tower then it make turn off mobile data and make turn on wifi and it knows that i reach home. same for work.
search in google `best tasker profiles` so you will see what i trying to explain

It's a feature of Android O
during the waiting, Tasker is the best app (and you don't need root to do this)
Envoyé de mon ONEPLUS A5000 en utilisant Tapatalk

Use lspeed in play store has built in setting for this to adjust different times

me myself and i said:
something ive been noticing is that i get alot of battery drain from wifi. most of it comes from searching for wifi and i leave it on because periodically throughout a day im in and out of my saved network's range. Id like it there was a setting or a system edit that would turn off the wifi after searching for 5 minutes and not finding one. i'm assuming the drainage is coming from the the MIMO technology or something. anyways, if you have something it would be greatly appreciated. Thanks.
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Click to collapse
u can use this app and save your preferred time settings on startup and u r good to go . . iam using it from a very long time it saves more battery . and can set wifi off once when u lock the phone also . u can set wifi hotspot connectivity timings also. u have settings that can change network to 2g when using WiFi (this saves u much battery drain from frequent network change). please view the full settings from the options in app. it has both root (required for only toggling networks)and non -root capability . please turnoff battery optimization for this app otherwise it wont work.. this app wont consume that much battery considering excessive battery drain due to frequent wifi search.
https://play.google.com/store/apps/details?id=com.sebouh00.smartwifitoggler&hl=en.
i think this would help u .