While erasing contact and setting my phone stop working showing round waiting circle and its not geting switched off also

while erasing contact and setting my phone stop working showing round waiting circle and its not geting switched off also

Try a Reset...
Reset  ( No Data will be Lost )
Press and hold the Sleep/Wake button and the Home button at the same time for at least ten seconds, until the Apple logo appears. Release the Buttons.
http://support.apple.com/kb/ht1430
If no joy...
Connect to iTunes on the computer you usually Sync with and “ Restore “...
http://support.apple.com/kb/HT1414
If necessary Place the Device into Recovery mode...
http://support.apple.com/kb/HT1808
Note on Recovery Mode.
You may need to try this More than Once...
Be sure to Follow ALL the Steps...
Once you have Recovered your Device...
Re-Sync your Content or Restore from the most recent Backup...
Restore from Backup
http://support.apple.com/kb/ht1766

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