Note that the correct spelling is "Telit"

I am currently using Wavecom:
http://www.wavecom.com/modules/m...s/products

Their "unique selling point" is the ability to embed a 'C' application directly into the module - so, in some (many?) cases, no external microcontroller is required at all!
See: http://www.wavecom.com/openat
And: http://www.antronics.co.uk/portfolio/m2m_modem
You can, of course, just use them as "dumb" modules with an external microcontroller; or go multiprocessor so that only the stuff that really needs to be external is external, and the rest is in the module - thus minimising the demands on the external hardware (and, hence, its const).

Telit do have a module with an ARM9 processor onboard that is totally free for user applications: http://www.telit.com/en/produc...=show&p=10

Other module vendors (including Telit) offer varions embedded "scripting" options.

You will find a lot of references to Siemens as a module provider - they are now called Cinterion: http://www.cinterion.com/home.html

Sagem also make modules: http://www.sagem-communications.com/index.php...id=921&L=0