Nokia N70

Hi, all first post to this group so be kind.

I lost my N70 on 3UK and they sent me a SE K610i as replacement. Nice phone
but I miss my smartphone capabilities.
So to the questions.

If I were to buy a SIM free and unlocked N70 and put my replacement SIM in
it, would it be as capable as my lost handset, i.e. would it still function
as a 3G handset with the same number and be able to run Opera etc?

P.S. I am also considering just going for an N73 Music Edition instead (same
questions as above).

Thanks,

Alan Monaghan