iPhone or Blackberry....what are you using?

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Iphone 3gs here. Overall I am quite happy, for some reason up until the latest OS for it came out (iOS4) I found it to be quite laggy picking up calls for some reason and I would quite often miss the call while trying to answer it. Since the new OS came out it has been quite a bit better so overall I am now really happy.

I dislike the short battery life and the fact that I can't upgrade the memory with a microSD card or something like that. Otherwise very happy.