The network coverage is very good in cities, towns and even in the the villages . It has the widest 4G network in India and the fastest growing network in the world but the internet speed is not too good, it is about 300kb/s which is very low comparing to other 4G network in India. Calling facility is also not too good as it takes too much time to connect and it is very difficult to connect to other networks. I have called to service center for 2 to 3 times and they helped me so in my view the customer service is good. As everyone knows that it is free till 31st march and after 31st march you have to pay for the service.