Developers' Blogs: Pete

It's a quite good idea to back up your mobile, because if it dies (or the SIM inside), you probably will loose more or less vital information like phone numbers, SMSes...

I haven't found yet a good software to do it (GSMlib have some software, it might wort to check out). Some vital references for hacking with GSM capable modems:

The extended AT command set for GSM modems, in a nutshell
http://www.traud.de/gsm/atex.htm

GSM related work at SZTAKI (by Gabor Kiss)
http://gatling.ikk.sztaki.hu/~kissg/gsm/
http://gatling.ikk.sztaki.hu/~kissg/gsm/atscan/siemens_s55.txt

GSM modem faq with some relevant comments and their explanation
http://www.gsm-modem.de/gsm-faq.html