I called at the Gurgaon customar care to find out a few things for airtel
1) Airtel prepaid doesn't support POP3 or IMAP4, with NOP or Airtel Live
2) U can send MMS only to other Airtel users
. This was said by the CC guy cos whenever I tried to send an MMS i got a messege "Unsupported content"
3) High call rates, Rs 2.4 for STD
4) Can't use it on a computer
I was wrong, Airtel is not that good for GPRS, well...if u don't need POP3 & can live by checking mails using Opera\Opera Mini & get a Rs 69 tariff card too, then go with Airtel
else go with Hutch, 10 paise for 10 KB & everything works including MMS to any carrier & POP3\IMAP4. Its costly but atleast it works
Donno about Idea, but there unlimited GPRS plan costs Rs 150 per month & you can use it on computer too.
Although I use a K750i, my personal choice for a phone in such enviroment is Nokia N72, small & sleek & proper Opera with access to memory card something in which Opera Mini lacks