Turning data roaming on my mobile phone on or off
Turning the screen lock on my mobile phone on or off
Restarting my mobile phone
Writing text on my mobile phone
Ending active applications on my mobile phone
Your mobile phone may not react due to overload or errors in the operating system. If this happens, it might help to restart your mobile phone.
Restart your mobile phone
Remove the battery for about 10-15 seconds.
Turn on your mobile phone.
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