I have jio sim and airtel sim .I use both the Sims for few days and I observed that the speed of internet in jio is very very best as compared to airtel and all others sim cards . Their internet charge packs also best the best as compared to all others sim . When you recharge your jio sim card from my Jio app they give you a best cash back on every recharge. In others sims you don’t get this opportunity . Now jio gives us free 10 GB data because they winning the award .So I suggest you if you have new smartphone and you want to buy sim so buy please jio sim card .