There is of course always the option of just tethering an old phone to a Linux or Windows machine. I've played around in the past with an old Nokia, using a Linux-compatible knockoff DKU-5 cable (I bought mine from http://www.affordablecomputers.co.nz/ but I assume other retailers will have them). There's a whole suite of tools available for Linux to interface with a phone in this configuration and send SMSes. Throw an MTA and something like monit in to the mix, and you have a very cheap SMS monitoring solution that doesn't depend on any external ( besides the cell network of course ;) ). One thing to watch out for though is the official Nokia DKU-5 cable uses a custom chip not yet supported under the Linux kernel. -Michael Fincham Unleash Technology Solutions
We exclusively use SMS modems here.
The Wavecom is the best you can buy and only slightly dearer then the cheaper models.
http://www.itx.co.nz/index.php?cPath=29
is a company I've dealt with before and they are allright.
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-- -Michael Fincham Unleash Technology Solutions