This is how the process works:
1. You will get an SMS asking if you would like to opt for the new service.
2. When you request for a new SIM, Airtel will be trying to deliver it at your address within four hours. Everyone may not get it within four hours, most SIM card seem to be delivered within the same day.
3. To swap the SIM, you need to text the 20-digit number at the back of the new card to 121 prefixing SIM. After accepting the request select 1 to confirm.
4. After few minutes the service on your older SIM will be stopped. Once that happens, insert the new SIM and wait for the network.
5. You will get a message with the new Internet settings. The 4G service is ready to work.
In my case the entire process from the first SMS (step 3) with the SIM swap request taken within 12 minutes. The SIM delivery happened the same day, but not within 4 hours as promised.
These are the steps you nee to follow to upgrade your sim to 4G. Some users will need to upgrade their plans to avail 4G services.
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