I am using Reliance’s JIO service since last one month and I am very satisfied with it.
The internet speeds are awesome. What else could you expect when you are getting free everything for 3 months without paying a single penny.
However, there are some problems in connecting VOLTE calls, The call drop rates are very high. Only 25% calls are getting connected. But, as they siad, it is on test base, so its OK .
But I mainly purchased this sim card for data services and I am very satisfied with it.
Must go for JIO.