EC200U-CN not getting network


I am using EC200U-CN For GSM And UART, USB port is not connected. AT commands working fine but GSM is hanging state.
For command AT+QNWINFO
gives No service

Please can someone help me with this ?

Thank you

First, check whether to register for GSM network with at+creg?. You should check whether the sim card is recognized, whether the antenna is plugged in, whether the module is fully functional, automatic network search, etc.
Thank you.