Sony Xperia Miro - Soft reset
To soft reset your phone press and hold the Power/Lock button for a 2-3 seconds and the phone will restart. Wait about 10 seconds and then press and hold the Power/Lock button again to restart.
If that doesn't work, then remove the battery (if it has one). Wait 30 seconds and put the battery back in. Then press the Power/Lock button to turn the phone on.
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