because the total cost of my 18month Tmobile n900 order is £467, which makes it £75 more expensive than the cheapest sim-free deal for the n900. given that i spend £10/month on PayG credit currently (which is about as cheap as it is possible to be), if you take the sim free cost of £392 and add £180 in monthly cost you come to a grand total of £572. which makes it £105 more expensive to go sim-free for a product that has ZERO data and less minutes/texts than the contract will provide. that make it any clearer?