My best phone is my TP2, but if there was another it would be the BB Curve 8330. If it had flash I would still have it.
The worse phone... I guess it would be the Dell Axim x51v. I never could get it to call out or receive calls.
Before you cry out what a dumb a$$ I am, I know that it was a PDA and not a phone.
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But I don't think I ever owned a bad phone.