Well if u ask me then I would say go for it coz I have been useing airtel since the service started in mumbai and I have found better service then orange and bpl mobile any day..... airtel has made a good make for the start and they have got more service then orange and bpl moblie atlest its really good and the connections are faster then both bpl and orange and the best part is u get clear voice which is filtered and no disturbance at all.
i have even tryed my cell from the bank locker and I was surprised to get such a clear recption then orange or bpl
it been more then a month since I have been using airtel and the billing has no problem at all as it gives u all the details u would like to have such as mo on which call was made how much time u were on each call and it also gives u a detailed report on sms u send or recive but the incoming sms is free but over all if u ask me I would say air tel is better then orange and bpl any time no busy networks during peek hours too.
so go for it