My iphone 3.1.3 says Sim failure!Help!?

Priscila

New member
I have an iphone 3.1.3.I bought it used they did have an at&t carrier but they obviously canceled it.So now I'm trying to put my t mobile Sim card which works fine with my old t mobile phone but with this iphone it says Sim failure,but i did notice something different it has a little gray bar at the top I tried calling all my contacts but it says call failed.Help!PLZ!10 POINTS GUARANTEED TO THE BEST ANSWER WHO SOLVES MY SUPER SAD PROBLEM!
 
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