I love my Innopocket case, but not the belt clip. I just tried the Handspring Sport Case and the treo 650 inside its lovely innopocket case fits well inside the Handspring Sport Case. I don't know how you'd attatch an earphone inside the Handspring Sport Case but I gues a hole could be drilled. Maybe it's a case of too much coverage, but I feel safer. Now if someone would make a external case that would have an additional pocket for the Tom Tom blue tooth gps device I'd be very happy.