Jio Sims or Relience Jio or whatever you say, are very popular now a days in india with their welcome offer for free calls and internet but with some advantages and disadvantages .first of all if you want jio sim than be ready with very strange term of Jio that is your ID proof they wand only aadhaar card with your thumb impression.
Advantages:
Free Calls
Free Internet
Free Excess of TV channels
Disadvantages:
Call Drop
Available at 4G Handsets only.
my recommendation is that if you want free than go with Jio. but if you want some quality in your network than jio is not recommend.