eSIM is a digital SIM that is embedded into compatible smartphones. It allows users to access services without inserting a physical SIM card. Airtel offers eSIM support for select smartphones from Apple, Google, Samsung, Motorola and Vivo. Airtel's eSIM works either alongside or instead of a physical SIM card. Here is a step-by-step guide on how to activate an Airtel eSIM on your smartphone.