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Old August 22nd, 2010, 04:08 PM   #1 (permalink)
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Default Switching from 3g to 2g possible?

When looking at the specs for my phone, it says you can get more talk time from 2g, how do i switch back and forth ?

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Old August 22nd, 2010, 05:06 PM   #2 (permalink)
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You have to enter the service menu to do it. Either download SamServMode from the marketplace, or enter *#*#197328640#*#* into the dailer. From there, to into the debug menu, phone control, UE state control and you can force the phone into 2G or 3G from there.
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Old August 23rd, 2010, 01:19 AM   #3 (permalink)
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thank you, i grabbed the app, being phone noobie, what option in UE state control changes 3g to 2g?
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Old August 23rd, 2010, 06:20 AM   #4 (permalink)
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[3] CHANGE RAT TO GSM puts the radio into EDGE (2G) mode
[2] CHANGE RAT TO WCDMA puts it back into 3G mode
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Old October 14th, 2010, 11:01 AM   #5 (permalink)
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I tested this out and I decided I may not use it. Before you change the UE State for the first time, check check out what your CURRENT CONNECT STATE is. If you haven't changed your UE State since your last reboot before you access this the state will be "RAT is DUAL".

DUAL as is Dual mode (3G or GSM, whichever works in the area you are in). When you change RAT to GSM it limits your phone to GSM. That's what you want it to do. But, when you change RAT to WCDMA, it doesn't go back to Dual mode, it switches to 3G only. So if you lose your 3G connection you won't be able to connect to available GSM signals in the area unless you reboot your phone.
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Old October 14th, 2010, 11:22 AM   #6 (permalink)
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I don't know if anyone else who has done this has noticed or not, but sadly, this method doesn't do a particularly good job of forcing anything at all really. This method behaves more like a preference rather than a rule. For example, if you're in a weak 3G are but strong 2G area, then you might want your phone to be forced to use the weaker 3G signal for data vs the stronger 2G. However, using the UE state control, you're really only setting a preference. In other words, where with other phones, if you have them set to exclusively use one type of signal vs another, if that type of signal runs out, then you effectively have no signal, even if the other type of signal is strong. Not the case with our Captivates. If you set your UE state to 2G only, and say you have no 2G signal, but some 3G, then the phone will still switch over to 3G.

Basically, from what I have seen, the UE state control only changes the phone's preference for one type of signal vs the other, but it's not exclusive; if you have 0 signal of one type, but still a little bit of the other type, it'll still fail back to the non-preferred signal type as long as there's at least something there.
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Old October 14th, 2010, 11:50 AM   #7 (permalink)
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Quote:
Originally Posted by mnemonicj View Post
I tested this out and I decided I may not use it. Before you change the UE State for the first time, check check out what your CURRENT CONNECT STATE is. If you haven't changed your UE State since your last reboot before you access this the state will be "RAT is DUAL".

DUAL as is Dual mode (3G or GSM, whichever works in the area you are in). When you change RAT to GSM it limits your phone to GSM. That's what you want it to do. But, when you change RAT to WCDMA, it doesn't go back to Dual mode, it switches to 3G only. So if you lose your 3G connection you won't be able to connect to available GSM signals in the area unless you reboot your phone.
Turning Airplane mode on and off will reset it to Dual. No reboot necessary.
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 The Samsung Captivate is AT&T's version of the Samsung Galaxy S, marking Samsung's first strong push into high-end Android territory. The manufacturer simultaneously launched the Galaxy S on every major American carrier, each reta... Read More

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