New airtel sim SMS problem "Content not supported" in sim800c


My new airtel SIM is sending SMS from SIM800c but it shows as “Content not supported” in my mobile. The product is in production and able to work with multiple SIMs. But newly purchased Airtel SIM is working for call and able to receive SMS but the SMS sent from SIM800c is not supported in mobile, the received SMS in my mobile shows “Content not supported”.

Kindly suggest how to resolve this issue.