Getting SIM Busy error with BG96 modem

I have an Airtel SIM and it’s working fine with BG96 modem.
For another airtel SIM I am always getting CSQ as 99 (+CSQ: 99,99)
When I sent AT+CPIN? to check the status of the SIM, I am always getting “+CME ERROR: 14”.
I am unable to find, why this sim is not working.

+CME ERROR: 14 means that sim card busy


pls insert this SIM into your phone to check , if it can be detected normally .