This may be a simple question, but I suspect the answer won't be altogether
straightforward.

I am interested in getting a new Nokia E51. It doesn't seem to be released
by Vodafone yet. In any case, would I be better off getting an un-branded
version rather than Vodafone's version? In addition to the 'normal' phone I
am particularly interested in web and email access, and in VOIP - this last
would be the decider for me.

Advice please, anybody?