I used airtel almost more than a year. I use to do recharge for 3g they use to give me services of 2g. I did lots of complaints, but its for no use. Finally they said they dont have network in this area( ulhasnagar, kalyan) . I said your advertisements says they will provide you network in the any area.
Ulhasnagar come under thane district, airtel dont give services here. Pathetic services. Now I finally switched to idea postpaid. Hope I will get good services from idea.