Maybe the high return rates have somehting to do with the crap quality of those phones (and he artificial limitation on the number of tracks stored). A coworker of mine is on his third RAZR, and this one has problems with the keypad not always lighting up when he opens it, he just has to close and reopen it several times until it decides to work. He has a friend who got a SLVR and he says it has problems, too.
Apple needs to get iTunes into Sony-Ericsson and Nokia handsets. Unfortunately, I believe both of those companies wish to start their own mobile music download services instead.