Dear,
don't go for airtel. Their customer care is very bad and no active response at all.
1. since two years I am complaining - no signal at nizampet
2. when broadband / land line is dead.. no way to call them.. no toll free number.
3. no toll free.. but it will go throuhg several ivr quesiton.. it will take you through min 7-10 min to register your complaint.

Subra