To clear up any confusion, if we're talking US based carriers (primarily ATT here) then the following phones ONLY can use logos:
5160i
5165
6160m
8260
7160(when released)
The 5100 and 6100's have a cable available. The 8260 is done via e-mail as there is no cable yet. The 7160 would use the same cable as the 5100/6100. Logomanger (
www.logomanger.co.uk) should work with the new 51/6100 models and the data cable. There may be a way to send logos via SMS e-mail too, but I don't know the format.
Any xx20 series phone will not work with logos. Any xx90 phone will, since they're GSM.