My iPhone 4S screen is going crazy

I bought my iPhone 4S 3 months ago. Since last week, after going under the airport X-rays, the screen is going crazy, either it freezes, or opens things randomly, or doesn't work on parts of the surface.
The problem is that I bought it sim-lock free in Madrid's Apple store, but now I live in Tunisia. The only support here is provided by the carrier (Orange Tunisie) is for the iPhones sold by them. I don't know what to do. I thought the warranty was a global one for the sim-lock free ones.
PLEASE HELP!

Did you try to set it up as new device? How to back up your data and set up as a new device
And your device has to be officially unlocked, to work with other SIM cards.

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