HT1937 iphone model A1387 problem with "invalid sim" card. How to reset

After about three months of trouble free use suddenly I have lost connection with cell phone carrier with a "invalid sim". I now understand its my model phone, A1387, so now how to fix this problem?

No not yet, its my understanding that this problem has been documented and their is fix out there somewhere. I bought this phone from Apple while on leave. Now I live in Kyrgyzstan, cell phone cariers are rare and to trouble shoot by purchasing another sim card, may work again but also may not work. So Iam seeking help with a more permanate fix/upgrade. I heard this is a problem with this model or this OS.

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