The quad-band phones I referred to are GSM only, able to use 850, 900, 1800 & 1900 MHz. Now that I'm in the US I need a phone for work & my tri-band T39 lacks the US 850Mhz frequency, reducing coverage. We wanted quad-band instead of a US-specific phone so we have coverage when in Oz & UK.
Yesterday I got a Motorola MPx220 (Windoze....blegh! I'm already annoyed at the way some things are foisted on the user or can't be changed but it was on special for new customers) for the frequencies, MP3 player, memory card slot & ability to view Word & Excel files. I really, really wanted the Linux operated A780 but availability is almost non-existant & prices sky-high.
My other half got the Motorola V551. I suspect it has a better interface since it's not hampered by M$. I think she prefers the MPx but she wasn't eligible for a new customer price so that left the V551.