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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 Applications.
Press Settings.
Press Wireless and network.
Press Mobile networks.
Press Network mode.
Select network mode
Press GSM/WCDMA (auto mode) or WCDMA only.
Exit
Press the Home key to return to standby mode.
Or select...
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