Buying a SIM card in India is a relatively simple process, but there are a few things you need to know before you get started. First, you’ll need to find a mobile network operator (MNO) that offers service in the area where you’ll be using your phone. There are several MNOs to choose from in India, including Airtel, Vodafone, Idea, and Reliance Jio.
Once you’ve chosen an MNO, you’ll need to visit one of their retail stores or authorized dealers. You’ll need to bring your passport or other government-issued ID card with you, as well as a recent passport-sized photograph. The MNO will then issue you a SIM card and activate your account.