this is how to guide I created myself. The other method of changing from 3g to 2g from dialer ##3282 it does not stick on AT&T Flash. This method work has long has you do not power off the phone..
You do not need to unlock your phone or use any special tricks. Just follow the steps listed below.
Should work for almost all phone's
Change from 3g or 4g to 2g/Edge Mode to Converse Battery. This can be done from the diag menu debug option. Use with Caution, do not change anything else in the menu unless specified to do so.
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Dial ##634#
Diagnosis should install, else if already installed launch diagnosis from app list
Dial *#197328640# - Bring Up Main Menu
Press 1 Debug Screen
Press 8 Phone Control
Press 7 Network Control
Press 4 Aquistion Order
This is menu in which you can change from Edge to 3g/4g Mode.
1)Automatic - this chooses the best option which is usually umts_gsm
2)GSM_UMTS - if you select this Edge/2g Mode is activated
3)UMTS_GSM - if you select this 3g/4g Mode is activated
4)No Change - leave has alone.
Select 2, GSM_UMTS for Edge Mode
now press "end" key,
back key
Now Power Off Phone, leave off for 30 or so seconds.
Restart the Phone
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You should now be in Edge Mode when cellular data is turned on.
If you need to change back to 3g/4g mode follows the steps above expect select 3)umts_gsm mode
============================================================
Update: After a few days of testing noticed a few things..
1) if you power off your phone it will reset back to it default state
2) if 3g/4g signal strength is really strong, phone will switch to use 3g/4g speeds, but will remain in gsm_umts mode.
3) Slighty better battery when in gsm_umts mode with cell data turned on..
You do not need to unlock your phone or use any special tricks. Just follow the steps listed below.
Should work for almost all phone's
Change from 3g or 4g to 2g/Edge Mode to Converse Battery. This can be done from the diag menu debug option. Use with Caution, do not change anything else in the menu unless specified to do so.
============================================================
Dial ##634#
Diagnosis should install, else if already installed launch diagnosis from app list
Dial *#197328640# - Bring Up Main Menu
Press 1 Debug Screen
Press 8 Phone Control
Press 7 Network Control
Press 4 Aquistion Order
This is menu in which you can change from Edge to 3g/4g Mode.
1)Automatic - this chooses the best option which is usually umts_gsm
2)GSM_UMTS - if you select this Edge/2g Mode is activated
3)UMTS_GSM - if you select this 3g/4g Mode is activated
4)No Change - leave has alone.
Select 2, GSM_UMTS for Edge Mode
now press "end" key,
back key
Now Power Off Phone, leave off for 30 or so seconds.
Restart the Phone
============================================================
You should now be in Edge Mode when cellular data is turned on.
If you need to change back to 3g/4g mode follows the steps above expect select 3)umts_gsm mode
============================================================
Update: After a few days of testing noticed a few things..
1) if you power off your phone it will reset back to it default state
2) if 3g/4g signal strength is really strong, phone will switch to use 3g/4g speeds, but will remain in gsm_umts mode.
3) Slighty better battery when in gsm_umts mode with cell data turned on..
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