Develop Bugs

[Q] Using 3G and 4G at the same time?

Has anyone been looking into running the 3G and 4G radios simultaneously?
Aside from the benefit of having an additional 1-2MB/s, I get very frustrated when I am in the middle of downloading something and I come into a 4G area. Since the phone will always choose 4G over 3G, the connection resets. I would love to have a way to keep the path available to the app using it.
I guess the same problem exists when Wifi is on and the phone connects to wifi while downloading over 3g or 4g.
Can this be done?

I also would love to see a dev pick this up. It could save my marriage...

great idea. Being able to simultaneously use them and multithread downloads would be awesome.

I'd be happy if someone could fix the transition from 3g to 4g and vice versa. Nothing like downloading a file from your phone and then you lose 4g and it loses the entire session and has to be redownloaded.

Thread moved to Q&A.

DssTrainer said:
I'd be happy if someone could fix the transition from 3g to 4g and vice versa. Nothing like downloading a file from your phone and then you lose 4g and it loses the entire session and has to be redownloaded.
Click to expand...
Click to collapse
That's going to be unlikely, as 3G and 4G are separate networks operated by separate providers (Clear vs Sprint). That's why I want to keep the 3G connection alive.

sw99 said:
That's going to be unlikely, as 3G and 4G are separate networks operated by separate providers (Clear vs Sprint). That's why I want to keep the 3G connection alive.
Click to expand...
Click to collapse
I don't think clear wire is responsible for everyones 4g, just a select group

chandlerw88 said:
I don't think clear wire is responsible for everyones 4g, just a select group
Click to expand...
Click to collapse
I could be wrong but I think sprint just resells clear wimax and calls it america's first 4g network.

sw99 said:
Has anyone been looking into running the 3G and 4G radios simultaneously?
Aside from the benefit of having an additional 1-2MB/s, I get very frustrated when I am in the middle of downloading something and I come into a 4G area. Since the phone will always choose 4G over 3G, the connection resets. I would love to have a way to keep the path available to the app using it.
I guess the same problem exists when Wifi is on and the phone connects to wifi while downloading over 3g or 4g.
Can this be done?
Click to expand...
Click to collapse
When connecting to 4g or Wifi the 3g radio never really shuts off. The data part of the radio goes to sleep while the voice part remains active to send or receive calls or txts.
The 3g data service going to sleep when connected to the others is by design because it is slower than the other two services.
If you don't want the connection to reset turn 4g and wifi off, and only turn them on when you need the greater data speed. (this will also save your battery)
Also another solution is using one of the location based apps that will turn those on and off based off gps location.

Its not that i don't want to use 4g, i wish i could but its not reliable enough. If i have a large download, I'd like it to stay on the reliable network, but i still want to use the fast network.
I agree that the 3g network is still available, I'm hoping there is a way to force a static route over the 3g when needed.
Sent from my PC36100 using XDA App

[Q] WIMAX disconnects and never attempts to reconnect

I live in the suburbs of Houston where the WiMAX coverage is kind of spotty. If I leave an area of coverage for more than like say a minute, my 4G will stop attempting to scan for a new 4G signal and never attempt to reconnect even if I enter a new area with 4G coverage. I have to manually toggle the connection in the notification bar.
I've searched the forums and noticed several posts describing the same issue.
Does anyone have a solution?

AzN1337c0d3r said:
I live in the suburbs of Houston where the WiMAX coverage is kind of spotty. If I leave an area of coverage for more than like say a minute, my 4G will stop attempting to scan for a new 4G signal and never attempt to reconnect even if I enter a new area with 4G coverage. I have to manually toggle the connection in the notification bar.
I've searched the forums and noticed several posts describing the same issue.
Does anyone have a solution?
Click to expand...
Click to collapse
I have seen this issue as well, do you use bluetooth? I know its a random question but I have only noticed this issue with mine when I have the bluetooth on.

rayprobg said:
I have seen this issue as well, do you use bluetooth? I know its a random question but I have only noticed this issue with mine when I have the bluetooth on.
Click to expand...
Click to collapse
Bluetooth is not turned for on my device.

Bump. Anyone else having this issue?

I'm using the phone app so I don't know the link, but there's a link in general, I think, that describes increasing 4g performance. There's two simple tweaks to do and some involved ones. I just did the two simple ones. One is to change the retry interval down to 15 seconds and the minimum signal level for 4g lock is -110db. Those two changes made a noticeable improvement on fringe areas and inside for me.

forum.xda-developers.com/showthread.php?t=1265990

oscarthegrouch said:
forum.xda-developers.com/showthread.php?t=1265990
Click to expand...
Click to collapse
I did those tweaks, that is not the issue. I have tried all the WiMax_Scan_Retry from 1 to 300 and the WiMAX will never reconnect.
For example: I do not have 4G at school and I have 4G at home. If I drive to school, the 4G will disconnect.
Then when I drive home back into 4G coverage and go to sleep even after 10 hours, the 4G will not reconnect.

Bump!!! Also have this issue.
Sent from my SPH-D710 using XDA App

AzN1337c0d3r said:
I did those tweaks, that is not the issue. I have tried all the WiMax_Scan_Retry from 1 to 300 and the WiMAX will never reconnect.
For example: I do not have 4G at school and I have 4G at home. If I drive to school, the 4G will disconnect.
Then when I drive home back into 4G coverage and go to sleep even after 10 hours, the 4G will not reconnect.
Click to expand...
Click to collapse
Try doing what most people do, when you know your leaving a 4g area turn it off. Then turn it back on when you get home. No sense in wasting battery. That and it only takes a couple seconds to turn out back on and reconnect.
Sent from my SPH-D710 using Tapatalk

Khilbron said:
Try doing what most people do, when you know your leaving a 4g area turn it off. Then turn it back on when you get home. No sense in wasting battery. That and it only takes a couple seconds to turn out back on and reconnect.
Sent from my SPH-D710 using Tapatalk
Click to expand...
Click to collapse
I have extended battery that will literally last days even with 4G on so that is not an issue for me. Besides, this is not a viable solution if I want 4G in the car and it moves in and out of areas of spotty coverage. 3G where I live is about as fast as 1x.

Mod? Rooted? Modem?
Is your phone software on stock?
What OTA updates/mods are you running?
Kernel/Modem versions?
It would be good to know of the people seeing these problems have similar software/mods/modems.

mightypenguin said:
Is your phone software on stock?
What OTA updates/mods are you running?
Kernel/Modem versions?
It would be good to know of the people seeing these problems have similar software/mods/modems.
Click to expand...
Click to collapse
I agree. Post your setup in detail. It will help to narrow this issue down. For example I had similar prob's on EL13 modem but with 26/29 flash all is good.
So more info plz.

mightypenguin said:
Is your phone software on stock?
What OTA updates/mods are you running?
Kernel/Modem versions?
It would be good to know of the people seeing these problems have similar software/mods/modems.
Click to expand...
Click to collapse
I tried these:
Stock/Stock+Root/Starburst/Caulkin
EK02/EL26/EL29
Rogue1.3/1.4

This may be an example where adjusting the WiMax settings in ##data# with MSL number will help. Try lowering minimum signal picked up from -89 to -110, you can also change how long it stays connected and how fast it reconnects too...and here's where to read about it all...I did it on my OG Epic, Nexus, and this phone but slightly modified settings..it could also be a kernel thing too. Some of the Nexus ICS ones do that and wont reconnect until you go into settings and toggle
http://forum.xda-developers.com/showthread.php?t=925898
Sent from my SPH-D710 using xda premium

AzN1337c0d3r said:
I tried these:
Stock/Stock+Root/Starburst/Caulkin
EK02/EL26/EL29
Rogue1.3/1.4
Click to expand...
Click to collapse
Ok now it's time to go to your local sprint store. Im outa ideas. You have done morethan most B4 choking a rep.LoL.

I have this same problem.. Sometimes sitting in the living room. When im outside i get 4 bars of 4g but inside i get 1. if some reason i get disconected, it seems to switch over to 3g and stay there without scanning again. If i walk outside again, still stays 3g until i toggle off and on 4g again....
UNnamed with EL29 leaked modem flashed with Gunslinger kern.......
Sent from my SPH-D710 using XDA App

Anyone know of an app that will toggle 4g for us when it loses connection?
Or maybe a tasker profile? I tried in tasker, but I can't seem to get it to do more than basic things. There a couple spots in town that always lose 4g when I drive by and never reconnects as well. 3g is slower than when I use roam control on 1x verizon.

Anyone else think the wifi/4g toggling is stupid?

Why is it if I have 4g "on" I can turn "on" my wifi but to turn "on" 4g my wifi must be "off"? Seems pretty dumb. At my work I have great wifi on one side of the building and 4g on the other side. I have to turn them both on in a certain order though. Is there a fix for this?
Sent from my SPH-D710 using xda premium

im pritty sure they use the same antenna array thats why its done like that

Because wifi sucks less battery. So if you have your wifi on then more than likely you are in a wifi area so why turn 4G on and drain battery. Only way around it is having 4g on and turning wifi on after. The way I see it switching from 4G to wifi is convenient for the battery that's why it's allowed, now if it were the opposite way your just killing battery switching 4g on when you have a wifi connection. You can still see 4g scan for service even when connected to wifi periodically when you have both wifi n 4g radio on (it scans and the min it connects wifi knocks off the connection). This also happens on my Evo 3D. So I guess it's to prevent battery drain..
Sent from my SPH-D710 using XDA App

kc_exactly said:
Why is it if I have 4g "on" I can turn "on" my wifi but to turn "on" 4g my wifi must be "off"? Seems pretty dumb. At my work I have great wifi on one side of the building and 4g on the other side. I have to turn them both on in a certain order though. Is there a fix for this?
Sent from my SPH-D710 using xda premium
Click to expand...
Click to collapse
Personally I like it. Where I work, there is no signal at my desk, so I am on WiFi. When I go outside to talk on the phone or take a break, I like only having to disable WiFi to get the 4G to turn on for faster browsing.
That coupled with the issue of the 4G not rescanning after a while, you may have to cycle your 4G anyways.

Where did my 4G go!

I live in area that does not have 4 g so it stays off, however today at airport I tried and no 4G toggle anywhere! Where did it go, I swore when I got s3 I tested 4G but now it's gone? Thanks for help.
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BiggieD said:
I live in area that does not have 4 g so it stays off, however today at airport I tried and no 4G toggle anywhere! Where did it go, I swore when I got s3 I tested 4G but now it's gone? Thanks for help.
Sent from my SPH-L710 using xda app-developers app
Click to expand...
Click to collapse
GS3 doent have a 4g "toggle" as you say...but you can make sure its enabled
settings-->more settings-->Mobile Network-->Network mode.
Preferred network mode should be set to "CDMA/LTE/EVDO"
If you have "CDMA/LTE/EVDO" enabled, anytime your in a Sprint LTE area your phone icon will switch from 3g to 4g.

n8te_1 said:
GS3 doent have a 4g "toggle" as you say...but you can make sure its enabled
settings-->more settings-->Mobile Network-->Network mode.
Preferred network mode should be set to "CDMA/LTE/EVDO"
If you have "CDMA/LTE/EVDO" enabled, anytime your in a Sprint LTE area your phone icon will switch from 3g to 4g.
Click to expand...
Click to collapse
doesn't it chew up more battery?

bigfamei said:
doesn't it chew up more battery?
Click to expand...
Click to collapse
it shouldnt chew up ure bttery at all, as all it does is search the network for 4gLTE and if it doesnt find it, it will automaticly go to sleep and try again like 2 or 3 hours later or periodically as it tells u. .however u do need to have sprint automatic connention left on in order for that work. atleast thats what i got from reading the sprint connection optimizer information it gave me.

Practitioner said:
it shouldnt chew up ure bttery at all, as all it does is search the network for 4gLTE and if it doesnt find it, it will automaticly go to sleep and try again like 2 or 3 hours later or periodically as it tells u. .however u do need to have sprint automatic connention left on in order for that work. atleast thats what i got from reading the sprint connection optimizer information it gave me.
Click to expand...
Click to collapse
The optimizer isn't for the LTE. I hate that garbage so I always leave it off. As long as your preferred network is set as stated above, it will automatically switch between them. Side note though, it may switch back to 3g if you don't have a very strong 4 g signal. It likes to be weird.
Sent from my SPH-L710 using xda app-developers app

Sounds like your thinking of a wimax phone. I I had a Motorola Photon and you had to physically turn 4g on and off on it.... I think most wimax 4g phones are that way.
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Do any of the custom ROMS have a toggle for 4g/3g? I live in a 4g area but sometimes the signal isn't strong enough so it goes to 3g. Quite annoying. It would be great to toggle 3g off and force 4g.

So I had s2 before s3, so I assume the s2 was a 4 -g wimax? It had a toggle widget.
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BiggieD said:
So I had s2 before s3, so I assume the s2 was a 4 -g wimax? It had a toggle widget.
Sent from my SPH-L710 using xda app-developers app
Click to expand...
Click to collapse
Correct !:good:

sssqueue said:
Do any of the custom ROMS have a toggle for 4g/3g? I live in a 4g area but sometimes the signal isn't strong enough so it goes to 3g. Quite annoying. It would be great to toggle 3g off and force 4g.
Click to expand...
Click to collapse
Have you tried updating to the new radio? I believe they boosted the power to give slightly better LTE connectivity in those kinds of environments.

There is a way to force LTE on the GS3. I did it with mine so that I could map out the LTE zones with sensorly a bit easier while I was driving over the weekend. The way I was able to do this is you need to have Nova Launcher downloaded and installed.
Once you do this, long press on the home screen and go to "Shortcuts".
Next click on "Activities"
Next scroll down to "IOTHiddenMenu"
Then scroll down and click on "IOTHiddenMenu : HDR1X_Selection"
Doing this will allow you to force LTE only mode. Keep in mind you WILL NOT be able to make any phone calls while doing this. For some reason the GS3 requires the phone to be in LTE + CDMA + EVDO Mode to make calls even if you have a very strong LTE signal.
Another app I would recommend downloading is called OpenSignalMaps. Once you have the LTE only mode turned on or even the normal LTE + CDMA mode, you can use this app to refresh your network by clicking the little refresh button at the bottom left of the app in the Overview tab. What this does is pretty much turn your phones mobile networks on and off and then scan for LTE first before scanning for EVDO. I have been able to connect to many more LTE sites by doing this. Even ones that are fairly far away.
Hope this all helps. Let me know if you have any extra questions.

No data connection at all
I have the settings on GSM/HSPA/LTE, but lost data connection completely. Tried to restart and turned on/off flight mode - still no data. Voice in and out is OK. I finally managed to reconnect by repeating the process. Is there a better way to reconnect?
Thanks.

Check out "Network"
https://play.google.com/store/apps/details?id=de.mangelow.network
It takes you to the network screen as well
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with the latest l13 radio my phone will not stay on 4g it is heavily biased to 3g and I do not know how to fix it. I am right next to the 4g towers.. ... any thoughts? Thanks

Thanks
Thanks. Unfortunately, the "Network" app would not run. So I followed a similar line, and found "3G Reconnect". It does not fix the connection issue. Any other thoughts?

LTE and 3g handoff problems

I just came back to sprint from Verizon and I have 4g in my area but its weak at my house. My problem is this. Ill habe tje 4g icon in the status bar but it wont do anyrhing cause its so weak but I cant get 3g to come on and sometimes when I switch off wifi I have no data at home until I reboot or toggle airplane mode. Its like its not switching between 3g and 4g properly. Anyone else have this problem? I just got the phone 3 daya ago and want to make sure its not my phone. Ill also have trouble when it does finally show 3g from 4g it takes a while bwfore the 3g will even give me internet access. Thanks for all the help guys.
Also I know I can just switch to evdo mode and it works fine thwn but its a oain to switch it to lte when I keave cause when I leavw the house I get good 4g service.
Sent from my SPH-L900 using xda premium

musclehead84 said:
I just came back to sprint from Verizon and I have 4g in my area but its weak at my house. My problem is this. Ill habe tje 4g icon in the status bar but it wont do anyrhing cause its so weak but I cant get 3g to come on and sometimes when I switch off wifi I have no data at home until I reboot or toggle airplane mode. Its like its not switching between 3g and 4g properly. Anyone else have this problem? I just got the phone 3 daya ago and want to make sure its not my phone. Ill also have trouble when it does finally show 3g from 4g it takes a while bwfore the 3g will even give me internet access. Thanks for all the help guys.
Also I know I can just switch to evdo mode and it works fine thwn but its a oain to switch it to lte when I keave cause when I leavw the house I get good 4g service.
Sent from my SPH-L900 using xda premium
Click to expand...
Click to collapse
4G is always a priority over 3G if you have it enabled. There's no way around it unless you switch lte off. So if you're in a weak 4G coverage and your phone gets the signal it will take over your 3G. Wifi is always 1st priority, 4G 2nd, then 3G, finally 2G. As long as those radio are on that's the order they work. Was always like that even in wimax devices. Switch to cdma while at home or connect to wifi.
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