Sprint Users: Check here
http://www.pandora.com/sprint for up-to-date compatible sprint phones straight from pandora.com... so far there are 20 sprint phones that are compatible, but only 2 are smartphone/pocket pc's (6900 and moto Q9C) which i think is kind of ridiculous considering the fact that 99% of Windows mobile users will have an Internet/Data plan and Others usually do not... Ugh.