Best Network Coverage across india. Review on Airtel Mobile Operator

I have using Airtel from last 7 years. I found that there is no network is in competition in terms of network coverage with Airtel. Airtel is the only operator which is provide you network in running train while travelling.I have used some other operator also but they all are vain.I used to travel a lot in trains so I need network coverage in trains, other operator have very poor network coverage in train route while airtel doesn't have any call drop,long lasting data connectivity. Airtel have good coverage in rural areas also where other operator doesn't have network where Airtel is the only network which is Available same thing is happens with me in my village. Airtel Call rate is little bit expensive as compare to other operator but when we talk about call quality &Airtel data plans is very expensive that is quite difficult for me.Data throughput is very good.I feel Airtel have best optimized network in india wheres noise congestion  is very less .Airtel Customer service is easily reachable by dialing 198 or 121.I recommend peoples who don't want to suffer for internet connectivity & call drop then go for Airtel.