Can I unlock my iphone 5 AT&T with R SIM 9 PRO?

I used R SIM 9 pro to unlock my iphone 5 AT&T and use it with Tmobil. I followed all steps and have T MOBIL anttena but I can't make a call and t-mobil signal will goes on and OFF. Any idea what is wrong?

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http://www.a1customer.com/cell-phones.html

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