[ahmadhali]

Every time i send and SMS my phone turns off and then turns back on my itself.

Somebody help me please?

[Roshanrims]

Check your firmware version by dialling *#0000# from home screen and look for updates from options. Install the new ware if available.
Other possibility is your memory. Where have you selected messages to be saved. Check it from messaging>settings>other> memory to be used.
Choose memory card here if not done already.
Switch to phone memory and see what happens(in case your memory card is corrupted).

[farby]

Remove as many as unwanted text msgs (recd. / sent).. and try..

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[varunaxis]

Try firmware upgrade or factory settings or remove any 3rd party softwares.. If not get it to a service center.. I had a "Water-log" problem in mine which made my handset restart over and again as it affects the mother board.