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Help No signal no matter who puts their sim card in

I have a Galaxy S and it was working fine then all of a sudden one day I could hardly ever get a signal. I gave it to a friend to try putting their active sim card in and it didn't work for them or one other person. We went through factory reset and nothing has worked. The signal bar area just has a circle with a line through it. (Like a "no" sign) Any help is appreciated.
 
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