Airtel (Free Internet) – Missed Call & Get 4GB 3G/4G Data:
1. Give A Missed Call On 52122 Through Your Airtel 4G Sim
2. Wait Some Time And You Will Recieve A Confirmation Message On Mobile
4. Internet Balance Will be Credited In Your Mobile Number Within 30 Minutes
5. To Check Your Internet Balance Dial *121*2#
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