In terms of network coverage airtel had a best place.iam fully satisfied with airtel services.Airtel placed a major role in internet services.3G is good.iam using airtel network for last 4 years.it has the best network coverage at any place.you can have full HD video and it also lanunched 4g service recently.it had a good call quality with less call late.this is one of the best quality in airtel services so everyone placed an attention on aitel