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Cause 3 of 3: 3G isn't selected as network type
If you want to make a video call, you need to select 3G as network type.
Solution: Select 3G as network type.
Find "Network mode"
Press the Menu key.
Press Settings.
Press Connectivity.
Press Network.
Press Network mode.
Select network mode
Press Dual mode, 3G or GSM.
Exit
Press the Menu key to return to standby mode.
Or select...
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