My iPhone keeps restarting

My phone is restarting for last two weeks. I went to future world support centre in collupitiya for 2 times. I bought my phone from uae and they checked my phone and said me that I can get help only from uae. But now my phone is shut down already I don't have a phone to use. This is not good, my phone is still less than 1 year. What I will use till I go back. I need help on this.

[Re-Titled by Moderator]