My sim card is no longer recognized by the ZTE Open sold on EBay

After 6 month of happy usage of my ZTE Open, manually upgraded to Firefos OS 1.3.
My phone suddenly does not recognize my sim card any more.
I performed some tests with other phones, other operators, and other sim cards that lead me to tell that the problem comes from the phone.
There was no special event that can explain this problem (no fall, no update, no water...).
I tried to retart the phone, to reset it. No way the sim card is recognized.
I seem to be able to call and receive phone calls, but no sms and no data.
Can you please help ?

Same thing with me, but SMS and data seem to work fine. Only seems to affect Usage app on my phone (ZTE Open C).

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My sim card is no longer recognized by the ZTE Open sold on EBay

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