Which network you get depends on the plan
The fixed-data plans run on Airtel. The unlimited day passes can use Airtel, Jio or Vi (Vodafone Idea), so they suit trips where one network may be weak. Neither uses BSNL, the state operator.
Coverage is strongest in the cities and along the main routes, and patchier in the mountains, deserts and on the islands. On the Andamans, travellers report that BSNL often has the best signal - and this eSIM cannot use it.
Keep your Indian SIM for banking codes
This eSIM gives you data, not an Indian phone number, so the SMS codes that banks and many ride-hailing and delivery apps send cannot reach it. UPI apps also expect the SIM of your registered Indian number to be in the phone.
If you have an Indian SIM - visiting family, for example - keep it in the second slot for calls, codes and UPI, and let the eSIM handle data: dual-SIM phones run both at once. Without an Indian number, check before you travel which of your apps offer another way to sign in.
eSIM or a local tourist SIM?
A local SIM is cheap, but foreign visitors usually need their passport and visa, a photo and often the name and number of a contact in India, and activation can take hours. The eSIM is set up at home before the trip.
Kashmir, Ladakh and mobile data shutdowns
The authorities sometimes switch off mobile internet in a particular district or state, notably in Jammu and Kashmir and in Manipur. India has recorded more shutdowns than any other country over the past decade, according to the digital-rights group Access Now. Shutdown orders go to the mobile networks in the area, so expect a travel eSIM to go offline too.
In Jammu and Kashmir and in Ladakh, prepaid SIMs from other parts of India are reported not to work, and travel eSIMs may not either. The UK advises against all travel to Jammu and Kashmir, except air travel to and from Jammu city and travel within it.