Help no sim card problem

[lukasr]

I have sgs3 and it dont recognize my sim card.
Imei is good, my network operator sayed that it not locked and not blacklisted.
When I put in other carrier sim, it works perfect. Maybe somebody have a solution ?
If you need more info ask, I will try to answer.

 

[Rukbat]

If it doesn't ask you for an unlock code, it's not locked, so it's probably a defective SIM card (which they should replace without charge).

 

[lukasr]

But I read that some operators do not ask unlock key and I tryed maybe 5 or 6 sim with that networm but it not worked

 

[lukasr]

Anybody will help ?