stuck app in android phone?

Roy

New member
I have a S.E. Xperia X10, I took the sim card out and put back the wrong way. I was still able to go on line so I didn't know. Until when I input the Back or Home button, nothing happened. I turn off the phone, realised the sim card was wrong way and put in back the right way. Turned the phone back on, it works a while but until open to 3rd app, it stuck on that app, Back & Home key not working again. Master reset the phone, still same thing. 3rd app and stuck. Please help.
 
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