This is basically what I gleaned from my time trying to work remotely from Vrindavan. I think the Indian mobile Internet services at the time are just starting to take off, so the phone guys mostly know how to set it up, but a lot of western visitors are still in the dark. A lot of the information here is either shamelessly cribbed from xda-developers or is my own work. I had a hard time getting pppd on OS X to play nicely with Idea and ended up having to write my own dial script for pppd.options. I’ll add this shortly.
Airtel (Delhi)
APN: airtelmms.com
Username/Password blank
Send sms with body:
MMS ACTV
to
222
Idea (U.P.)
APN: internet
Username: internet
Password: internet
Vodafone U.P. (formerly Hutch)
SMS with Body:
ACT VMC699
to
56789
You can also activate Vodafone Live by sending
ACT VL
to 52586
…though why you’d want to, i can’t imagine
APN: portalnmms
IP Address: 10.10.1.100