I have been using the airtel prepaid sim for two years almost in latur. it was giving fine quality of voice calls, data speed, and offers as well.
But when I shifted to lonavala it got stuck with the signals. even if I am on terrace, it cant catch signal. and when the phone is kept in the rack, it just like flight mode. You dont get a single signal.
And the data connectivity is so slow that you get irritated by its speed. you can not open a facebook login page upto 1min. the call quality is also very bad. Sometimes you hear the person on the call but he doesn t get your voice.