Thanks, I found a discussion on that at http://www.howardforums.com/archive/topic/1032294-1.html. The C417 requires a vintage SIM. And it may be the case that a 3G phone won't work properly without the current 3G SIM. Still, I don't know what Irish meant when he wrote "I'm not sure if the phone will read most settings from your SIM anyway." I presume that when Cingular releases the N75, it will use SKU 73000. If so, an unbranded N75 would take that SIM as well, unless I am seriously, if not catastrophically, mistaken.