When I bought Airtel 4 G sim for my smartphone I thought that Airtel provide best 4 G services but I am totally disappointed with the Airtel service. The Internet speed of four G network from Airtel is slow it works like 3G network there is so much of fluctuation in the Internet speed. Airtel making fool to customers they automatically deduct balance from my phone even when I did not subscribe to any service from Airtel. When I complaint to customer service they did not give any response to me. So I decided to switch to another network with the help of number portability.