Jaamun.in is an interesting web startup by alumni of IIT Delhi through which you can send or receive emails without mobile internet services or GPRS. Not only the emails, Jaamun also supports sending and receiving of Twitter, Orkut and even Facebook messages.
Jaamun does this by converting your mails or social networking messages into SMS and sending it your handset in real time. Jaamun aims to provide assistance to simple handset which does not support even GPRS.
To get started with Jaamun services you first have to sign up online or send a SMS with email id and password to 9773467755