Samsung Galaxy S4 mini — SIM problems with a unlock S4 mini

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May 22, 2015, 4:23:58 PM via Website

My wife has a factory unlock S4 mini. For over a year, it functioned fine with SIMs from AT&T and Movistar. On a recent trip to the US she got a T-Movil SIM and it didn't work. It doesn't recognizes the SIM. As a matter of fact, it doesn't recognizes the Movistar's which is the one she uses the more when traveling. The T-Movil SIM works perfect on other phones, but not on the S4. Is there something I can do to solve this problem. Please advice.

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