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Settings => More networks => Mobile networks => Network mode => GSM only
Press and hold the power button and a menu will pop up. Then tap on Data network mode to turn3g off. Repeat procedure to turn3g back on again.or Check your settings here: Settings -> More -> Mobile Networks -> Network Mode -> put GSM only.hope it will work.
To disable3g:
Go to Apps->Settings->Wireless & Networks->More->Mobile Networks->Network Mode
Select GSM only.
Or In ..->Mobile networks, select 'Use only2G networks'.
To disable data:
Touch from top to bottom. Then tap 'Data' to disable it.
If you didn't the above options, you must find it
..->Mobile Networks->Data Enabled check box.
