My favourite phone right now is the iPhone. Before that I had a Sony Ericsson W960i. While I enjoyed the robustness of the Symbian OS and the ability to install Symbian apps with it, in the end I was left disappointed. The UI was just plain against logic and the Symbian crashed a lot. I was looking forward to installing some apps, reminiscing back to my old Handspring Visor days, only to discover most of the apps available were either only for the Nokia Symbian phones or just plain sucked...

While I understand the limits of the iPhone, years of using phones that frustrated me (before the Sony Ericsson it was a Motorola RAZR, which I wanted to throw against a wall), I was willing to live with the limits in exchange for what is otherwise a truly amazing phone.