Using the music player on my mobile phone
Choosing a ringtone for my mobile phone
Writing and sending SMS
Turning data roaming on my mobile phone on or off
Using tethering 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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