I was in Phones 4 U today and they offered me an N70 for �49.99 on a �25 per month contract. I'd change that after six months to the �15 a month one though, so it all works out at.
(Phone) �49.99 + (first six months �25*6) �150 + (second six months �15*6) �90
= �289.99
That was in a shop so I assume that someone on the net does it cheaper?