May be there are a number of mobile network providers, providing services in low cost, but still the network coverage of Airtel is the best. Although other Networks have offered free mobile service from their network and of course many people have jumped to those networks, but as a main option, the people stayed with Airtel even today. Though the Airtel also offered free calling package and it is costly in comparison with other Network, but the regular customer of Airtel are preferring this Network only. this is because the best customer service with this Company. even the full time recharge packages are very comfortable.