How do you use bsnl sim card in airtel dongle 7.2?

To use a BSNL SIM card in an Airtel dongle (7.2 Mbps), first, ensure that the dongle is unlocked and compatible with the BSNL network. Insert the BSNL SIM card into the dongle, then connect the dongle to your computer. Install any necessary drivers and open the mobile broadband software. Finally, configure the connection settings according to BSNL's APN requirements, and you should be ready to access the internet.