In all honesty, even though PPCGeeks is supporting both GSM and CDMA, it's no secret that the majority of people on PPCGeeks is primarily CDMA. XDA has been known to focus more on the GSM phones. For GSM specific things, that would probably be the best source of information. Not to say you can't or won't be able to get information here, it's just that there are fewer GSM owners here then on XDA. I would start here
http://forum.xda-developers.com/forumdisplay.php?f=437