How to activate Airtel new sim - Checkout here

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. It only means that you are still using only 2G or 3G SIM. If this happens with you, the solution is to go for a replacement SIM and check the 4G SIM activation process. This is a simple process that can be done within a few easy steps. This same procedure applies for new as well as MNP users. Activating 4G will let you enjoy HD quality voice calls in addition to faster call set up time.

When you upgrade to a new Airtel 4G SIM, you will get a new 4G SIM. This is given free of cost and the new $G SIM will have adapters that can make it compatible with the Micro as well as Mini slots found in SIM-based smartphones. If you already have a new SIM and only waiting to activate it, follow the steps given below.

Easy steps for Airtel 4G SIM activation

• SMS the 20 digit SIM number from your existing Airtel connection to 121
• Reply typing 1 to confirm your request.
• Wait for some time for the phone to get disconnected from the network.
• Remove the old SIM and insert the new SIM in the slot.
• Switch on the phone and wait for 5 minutes.
• Your new 4G Airtel SIM will be active now.

Note: In this process of changing the SIM, you need not change your phone number. You can upgrade for the new Airtel 4G SIM at the nearest Airtel store.

See Also:
How to check Airtel Number
How to check Vodafone Number