Somthing wrong with Sim card

Hello,

I bought Iphone 2 years ago in Kazakhstan/Nur-Sultan. But they did not mentioned that it was sim locked phone. I realised it 2 weeks ago. I have changed my sim card and after that my phone does not accept any sim card. Every time I try to install sim card there are messages "The SIM card inserted in this iPhone does not appear to be supported. Only compatible SIM cards from a supported carrier may be used to activate iPhone. Please insert the SIM card that came with your iPhone or visit a supported carrier store."

But I have tried 4 different carrier of sim card and it does not work.

Please help me fix this problem

Best regards,

Raissa