Ai Thinker A7 Error SIM NOT INSERTED but SIM is Inserted

Hi,

I have an Arduino UNO connected to the A7 module.

It is replying AT commands well but it is not registered because it doesnt detect SIM Card and SIM is inserted right.

Anybody had this problem or know how to resolve it ?

Anybody know the function of the EN connector in A7 Module ?

Thanks