Airtel 4g. this is the best 4g service provide in india and this is the first 4g service in india. 4g service always good in airtel and I think airtel 4g best service provide for his customer and NEVER stopped working. Now that’s what I call reliable. The only time I had connectivity issues was when there was an issue with the sim card and all I had to do was take out the SIM and reinsert it.its very good 4g service in india