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my phone can't switch between 2g and 4g networks

I'm currently on stock tmobile jellybean and data works perfectly fine. However, it only works at either 4g speeds or 2g speeds. It can't switch between both when coverage in the area is bad.
Under mobile data settings, 4g appears when wcdma only is checked and 2g appears when gsm only is checked, but when I'm on gsm / wcdma auto, it doesn't switch between the two. gsm / wcdma auto only lets my phone use 4g. This is a hassle when I'm in certain areas where 4g connection is faulty and i need to use 2g. Is there a fix for this?

Tried any toggles from store? To switch on the fly. Might need root.
Verstuurd van mijn HTC One S met Tapatalk

[Q] Force S2 to 3G Networks

I am using a Galaxy S2 Skyrocket on the Dirty Unicorn rom and I was wondering how I can force my network to 3G. I have Straight Talk on AT&T and a very good LTE 4G signal but it drains my battery very quickly and I don't really need the speed of LTE and the speed of 3G works fine for the things I do.
I've tried in the Mobile Network settings to switch it to GSM/WCDMA preferred but it always immediately switches back to LTE/GSM/WCDMA mode and connects to LTE. The use only 2G networks option does not work either as it immediately gets turned back off as soon as you turn it on.
Using *#*#4636*#*# to switch the mode to WCDMA preferred or GSM preferred does not work either as it also switches back to LTE immediately after.
Is it possible to force the phone to 3G networks? On my old captivate samsung phone on a 4.2 JB rom, it was doable and it worked on 3G fine (even being a 4G enabled phone).

Here is what I've found works on AT&T but it might not work for you.
Go to mobile network settings and then Network Operators. In the Network Operators screen scan for networks. If two different networks appear select the one on the bottom. Then the 2G only button and other settings will work and stick until you reboot your phone. I have to change this every time I reboot. I hope this helps.
Sent from my SGH-I727 using xda app-developers app

Yes. That worked. Now I just need to figure out how to turn off the hspa so it just uses a 3G connection on WCDMA instead of hspa or hspa+
Sent from my SGH-I727 using xda app-developers app

I have been using this technique every time I reboot. Anyone know how to make this permanent?
Or perhaps automate it using tasker?

Thoughts on using this device in the US

Does anyone in the US use this device? if so, what network are you on?
I have AT&T but I can't connect to their HSPA network for some reason. I am stuck on edge.
Can this phone connect to AT&T's HSPA network?
Can it connect to T-mobile's?
Any help would be greatly appreciated.

I'm not from the US but i had the same problem being stuck on edge.. after few hours of searching i finally found a solution..
1. Go to >Setting>More Settings>Mobile Networks
2. Now click the mobile network which you are using to browse net
3. Click Network mode and choose WCDMA only
dont use auto or gsm.. use WCDMA because it is for 3G or HSDPA signal..
Click thanks if it helped..:thumbup:
Sent from my GT-I8262 using xda app-developers app

Network preferred

Hey guys, my girlfriend have this phone and she have problem with network, we set it to auto and when we are in 3/4G network phone more go to EDGE (E symbol) when browsing then (3g, H) how to set network preferred to WCDMA, we can only choose wcdma but shen we are in egde we dont have signal, is there any code or any app for that, i know that in other samsung phone this is possible to set and choos but i dont know why in core isnt, any suggestions?

Only work around is to place it in gsm/wcdma mode
Sent from my LG-E400 using Tapatalk 2

For 3G Set It To WCDMA
For 2G Set It To GSM Only
If Set On Auto Mode U Get Default Settings From Operator i.e if U Have 2G Plan U Get Edge And If You Are On 3G Plan You Get 3G
Moreover The Signal Also Depend On Area if there is no 3G support in that area u only get 2G
Sent from my GT-I8262 using XDA Premium 4 mobile app

Help ! My Verizon One M8 won't connect to GSM Networks.

I bought an M8 last month and with a luck like mine I got a Verizon variant.
The problem is it won't connect to 2g networks ( connects to 3g and 4g networks fine. )
First I thought Verizon variant won't be supporting GSM or 2g networks but I did my research and found that it supports GSM networks. My network gives excellent coverage for 2g in my area . My network's 3g and 4g coverage is really poor in my area so I am left with 2g only. If I set it to global mode, it will connect as long as 3g or 4g signals are available but will go on limited service once there are no 3g or 4g signals.
In network settings if I select GSM only it does not work. The network mode remains unchanged . All other network modes can be selected but not GSM only.
Even by dialling *#*#4636#*#* I can't select GSM only.
If I set it to GSM/UMTS/LTE it will connect to only 3g or 4g but will show limited service once there are no 3g or 4g signals .
I have tried a patch for Verizon phones with no 2g options but still no use.
It would be nice if I could any help what could be the problem.
It can't be hardware related because if the modem is damaged then 3g and 4g should also not work.