Bottom line is this :
A phone is a phone primarily. Everything else is secondary.
If you want an ipod that can make calls, buy an iPhone.
If you want a phone that is a great PDA and manages e-mails well - buy a blackberry
If you want a PDA that has more software available for it than PS3 has game titles - buy a WM phone.
I <3 my blackberry, 8830s with SD cards rock out even more, because they play everything (video, MP3) and they are rock solid in terms of OS, plus, the phone is clear.