Poor man's Multimedia messaging system

[villei]

We have software engineering project work course in our school and
our team have planned to make some kind of friend-to-friend
multimedia messaging system which is cheaper than operator's service.

We don't have any special equipment so we have planned to do it
something like this:

When user have chosen the message, recipient's phone number and
confirmed sending, our app sends (HTTP POST) the message to the
server (servlet) which stores the message to database. After this
the same app (in sender's phone) sends SMS (maybe some non-reserved
port?) to the recipient's phone where our receiving app are
listening that port and it can fetch (HTTP GET) the message from
server. SMS has to contain something information which identify
the message in the server (phone number and password?).

So what do you gurus think about this? I thought it's better ask
is this even possible before start wondering how to do this. And
of course good tips are welcome too =).

[igor25]

yes, it's possible
I have already done it