Linksutra is starting 2 way sms soon..its still in testing phase.
Linksutra users with their mobile registered on http://www.linksutra.com can now send their mail, sms to other users and other mail options via their sms to 56263
for SMS texting:
snd SMS to 56263 with keyword LGM and subkeyword as per you required.
LGM to@email.com subject;message (to [...]