I am Using Airtel 4g LTE in my I phone 6 Plus, I never every feels a poor internet speed, Airtel is little bit expensive, but it give variety of tension free features like . airtel money, a cash less transaction . just click a button & make cash less transaction . plus it offers you a free application named as AIRTEL from which you can see your data usage . and can buy some extra mbs or gbs with the help of this application . from my side I Love Airtel Service . in every city and in every village . I found a good experience with airtel . thanks airtel for such a break less service .