Airtel is having problem with its network. 4g and 3g keeps on changing. when I have 4g network , then if I call someone ya send text msg to someone 4g network becomes 3g and its takes 1minute to became 4g again. and in that time internet doenst not work. not only these happens in my phone these happens to everyone airtel need to fix these problem. and now a days airtel network has became poor . airtel should work on the customers problems.