On the N900 they dont add much I think possibly they add Voice mail preset and disable the Skype Function.. Possibly with a lot of the Networks in the Uk clamping down on the Data Usage or at least charging for it. They want to ensure some functions are restricted ie video calling and add others I dont know possibly Data counter (Just me guessing no fact to back it up) as plenty of N900 users in the Uk may not use the extras and non default repostries due to the device being sold online and in the shops as a Iphone type phone..