When I purchase my first keypad phone my first choice is AIRTEL. and now I use my smart phone today also my first sim choice is AIRTEL because many time I saw when we friends going to somewhere vilage or other places my friends sim network gone but in my mobile full range even my village place also whenever I wish to knowing some offers & plans I am calling 121 there customer servise treat me good and giving me best response. I just converted my second sim with AIRTEL POSTPAID PLAN they giving best afordable plans. and in futur I am going with only AIRTEL.