Im almost certain ill be going with Three in the UK, on a sim only deal. £15 a month. However im also still tempted by O2s simplicity tarrifs.
Ive been warned that when you buy an iPhone direct from Apple, £500 16g for example... that as soon as you put one networks sim inside, thats it. Your new phone is tied to that network from then on. Is this the case? As you buy what is essentially an unlocked iPhone from Apple can you not switch from Three to O2 every other month if you really wanted too?
Also, id be interested to hear what people think comparing Three and O2 as an iPhone service provider. Ive heard mix opinions from various shops, as you do

, as to whos best, whos got the quickest network?
One other question id like to ask... teathering on Three. Anyone had experience with this? On O2 you need to pay an additional £10 ontop of any contract to have this ability. How does it work on Three? Is there a similar charge?
Cheers