Firsty

Firsty offers 16 separate India-only data plans using a pay-per-day model, so you only pay for the days you actually use data. You can pause your allowance if you're offline for a few days, and charges stop automatically when you're done. Note that Firsty doesn't include SMS or phone number functionality, it's data-only.

This suits travelers who want maximum flexibility in how they spend, especially if your trip has mixed connectivity needs. If you'll be offline for part of your time in India (hiking, remote areas) but need data for other segments, Firsty's pause feature saves money compared to fixed-duration plans.