How to send a little notify about new email...

Problem:

I am expecting important email, but getting on line is not very easy (or
may cost a fortune), so I can't get on line to check my mail often enough.
I have a cellular phone where I can send short email messages and receive
them as text messages.

Idea:

Somehow use procmail to send a little notify message to my cell phone
address when the important email has arrived.

Question:

How can this be done? 

Thanks,

Tapani