How do I create a text messaging server.  I've seen recently on tv,
that people could text message their votes in.  It was asked that they
send a msg to some 4-digit number, and then space and either A, B, C,
e.g 2352 A.  I would like to setup an information service where people
could text message my server, and responds with an answers back to the
cellphone.  What software or service I would I need to create such a
service on my webserver.