After watching so many advertisement, I finally bought an airtel sim. But on using it I came to a conclusion that these advertisement are all fake as most of the time there was almost no network coverage in my area. I firstly thought that it was all because of my mobile but later on when I tried it in my brother’s as well as my father’s mobile I came to know that it was really the network issue. Hoping that in future airtel will try to improve their network in Allahabad.