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A possible (temporary) fix to 3G toggle...

Saw this on the AT&T forums, not sure if it works though.
Originally Posted by BecomingxInsane
I found out that if you go into the dialer and type in *#*#197328640#*#* that it will take you into a menu that will allow you to change it. From the main menu of the ServiceMode screen, select DEBUG SCREEN, then PHONE CONTROL at the bottom, then UE STATE CONTROL. From there select CHANGE RAT TO WCDMA to enable 3G only, and select CHANGE RAT TO GSM for 2G only.

this doesnt do anything at all .
i live in an area with no 3g coverage.. despite att sending me emails stating its be "coming" since last summer. anyways...
I set the phone to 3g only mode and I still get signal

Disable 3G/ Use EDGE Only

For all the people that need their battery for a day or more I wanted to add the instructions on how to disable 3G.
Go into the dialer and type in *#*#197328640#*#*
Select "Debug Screen" on the menu
then hit "Phone Control"
then "UE State Control"
"Change RAT to GSM" will turn off 3G access and will leave your DATA on 2G.
This will save lots of battery especially for those who have low 3G signals.
Please note that rebooting the phone or even turning on "Airplane mode" will reverse these changes.
This means you will have to change the settings again (this is also the fastest way to cancel the changes and go back to 3G).

Thanks a ton for this. I'm sure it was in another thread, but I always saw mixed reports and hadn't tried it myself.
I have a 3-4 bar EDGE signal in my office, but only a 0-3 3G signal, so this will be a lifesaver.
However, as soon as there's a ROM that adds the force 2G option that should be there back into settings (and removes any other locks AT&T put in the software), I'll probably go that direction just because it is a pretty clunky way to do something that should be an option as is.

I have something to add to this. If you use a reboot or airplane mode to turn 3G back on, the next time you go to turn 3G off, you may need to re-enable 3G (WCDMA) before changing back to GSM. Apparently, the setting didn't get changed in the debug menu even though I got switched to 3G, so I had to put it back on 3G first.

Is this still the only way to disable 3G but leave 2G enabled on the Captivate? The apps in the Market are still all or nothing (3G or no data connection at all).
Thanks!

3G, 2G disabling?
Is there a way to disable the 3G/2G altogether but still use wireless?

You can always put it in airplane mode and then turn WiFi on if you don't want to use the AT&T network at all.

[Q] "GSM only" setting

I need some help modifying a Froyo rom to include a "GSM only" setting.
The background is that under certain conditions (i.e. intermittently), the cell radio shows full connection, but will not allow calls, incoming or outgoing. I finally narrowed a workable solution down to forcing "GSM only" (vs. auto selection of CDMA and GSM networks). But I can only get there at the moment by adding the "Phone info" custom shortcut to my home screen (ADW Launcher) and going in and setting it manually. And unfortunately that doesn't always survive a reboot either.
I would like to simply pre-set that in the rom and not have to re-set it again. I had assumed it was something that could be done in one of the init or prop file, but I have thus far not been successful in finding information about where and how to do that.
Any help would be appreciated.

Solved. For anyone else who stumbles upon this question, the setting in build.prop is:
ro.telephony.default_network=#
Where the # is a number code for which setting you want. In my experimentation for my device, "ro.telephony.default_network=0" is WCDMA preferred and ro.telephony.default_network=1 is GSM only.
I "think" the other codes are as follows (but I can not confirm this):
0 WCDMA preferred
1 GSM only
2 WCDMA only
3 GSM auto (PRL)
4 CDMA auto (PRL)
5 CDMA only
6 EvDo only
7 GSM/CDMA auto (PRL)
8 Unknown
Additionally, if you want to set it temporarily while the phone is running, you can launch the phone info settings by entering this on your phone's keypad:
*#*#4636#*#*
But I believe it will revert to whatever you have in build.prop at the next reboot. No matter what you set in build.prop, you can still go into your Wireless & network settings, Mobile networks, and click on or off the "Use only 2G networks" setting.

[Q] WanHu ROM 2G/3G switching?

So I finally jumped in and got the WanHu ROM installed with M's v5 patch. This thing is really nice now, hopefully it will stay that way even after I reinstall some of my apps.
One thing that I've noticed is that the ability to use only 2G networks is gone. It used to be an option under Settings » Wireless controls » Mobile networks. Any chance that may be coming back?
I know some people would probably think I'm crazy to be asking that, but in my experience the batter life was pretty much double that of what I was getting on 3G, so I'd use that mode sometimes.
Thanks for all the good work on the WanHu ROM.

You can turn off the 3g at Settings >> Wireless networks >> Data Network settings & there is also a 3g widget.

Hi,
At this point you only turn data on or off. You cannot switch from 3g to 2g.
I would like to have this feature to, because the radio at my work is very poor and the battery last much longer in 2g.
Sent from my XT720 using XDA App

switch 2g , 3g, and 2g/3g
if i have to change the default network setting (3, which mean 3g/2g auto), i can from here:
1. from the dialpad dial *#*#4636#*#*
2. from the popued menu, choose Phone Information
3. from "Set preffered network type" You can choose several options including:
"GSM auto (PRL)" (this is usually default and means 3g and failback to 2g, depending on signal
"WCDMA prefered" (this mean 3g and if there is no 3g, then 2g), this settings seems to wotk, but if you exit and return to the same menu it is changed
"WCDMA only" 3g only
"GMS only" 2g only
hope that helps.
p.s. I use Battery monitor application, which has shortcut to the Phone Information menu.

peshovec said:
if i have to change the default network setting (3, which mean 3g/2g auto), i can from here:
1. from the dialpad dial *#*#4636#*#*
2. from the popued menu, choose Phone Information
3. from "Set preffered network type" You can choose several options including:
"GSM auto (PRL)" (this is usually default and means 3g and failback to 2g, depending on signal
"WCDMA prefered" (this mean 3g and if there is no 3g, then 2g), this settings seems to wotk, but if you exit and return to the same menu it is changed
"WCDMA only" 3g only
"GMS only" 2g only
hope that helps.
p.s. I use Battery monitor application, which has shortcut to the Phone Information menu.
Click to expand...
Click to collapse
Thanks for the reply. I was messing around in those menus and could not find a "GSM only" mode on my phone. I will look again, but all I remember were an "auto" mode, a "3g only" mode, and a bunch of CDMA stuff (which doesn't apply to our phones).
But I will look again and try out the battery monitor application program as that would be nicer than typing the key sequence everytime.
And just to expand my (rather small) knowledge of the android OS. The option to select only 2G under Settings » Wireless controls » Mobile networks, is that a framework thing that has to be added?
-J

[Q] Manual 3G Network switch problem

What I am trying to do is have ONLY 3G connection manually, to do this i added a tile in notification bar for 2G to 2G/3G switch, so when i select 2G|3G mode it connects to 3G but after some time it automatically selects 2G (because its 2G|3G, either strong one i guess).
I have also tried selected 3G in network settings, selecting LTE(recommended) also doesn't work.
But I want to be it in 3G mode exclusively even though 2G signal is better.
I have a rooted OPO and can install xposed too, any solution for this will be really helpful !!

Hi
Think you can do this by "dailing" the string *#*#4636#*#* in the dialer app, to bring up the Testing menu. Press "Phone information", then scroll down to "Set prefered network type", there is an option for "WCDMA only".

dazadaza said:
Hi
Think you can do this by "dailing" the string *#*#4636#*#* in the dialer app, to bring up the Testing menu. Press "Phone information", then scroll down to "Set prefered network type", there is an option for "WCDMA only".
Click to expand...
Click to collapse
Perfect.. that exactly what i was looking for !! Thanks..!!