Sometimes you might not be able to use Airtel 4G on your 4G ready smartphone. In this case, the problem can be with your SIM card ... SIM and check the 4G SIM activation process.

When you apply for it, you will get an Airtel 4G SIM card free of cost. This new SIM will provide you high-speed data network and HD voice calling facility. Here is how you can activate your ...