and then we shall be wirefree....

heard a while back that programming at a mobile phone carrier's end (such as Orange) is done entirely in C...would greatly appreciate if any1 can share their experiences/knowledge as far as that goes...what kinda logic building exercises are undertaken?...what does it entail and involve?...the kinda SW/HW involved?...are there any resources on the web that any1 might be aware of where more info can be gathered?...in one line - the whats and hows in a nutshell....just need a lead...looking forward...cheers!