All will work with internet in Rishikesh, but if you are staying in camp side in or above shivpuri area then don't have expectation for internet over there.
All sim work there mostly, but when you are at camp site so sometimes there will be network issues with very sim. I was using Airtel and my brother was using Jio, it was working fine in the city area but there were a lot of network issue at camp site.
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