Originally Posted by ConorJ
Thank you but I failed to mention i'm on pay as you go/pre pay so is the answer the same or different ?
The States are Zone 4 for tmob UK. £1.20 per minute for voice. You're getting charged both ways either calling or receiving (remember you're roaming).
Receiving can be reduced to 50p a minute if you subscribe to the international option (£2.50 a month on contracts, no clue about PAYG)
BB access is 0.73p per Kb and if you're lucky enough to camp on a 3G network it rounds up nicely to £7.50 per Mb.
Want some advice from a fellow londoner? Either get a short term contract for 30 days that cover the duration of your holiday or drop the BB in the room's safebox and forget about it. PAYG charges are pretty much ridiculous even when home. They become suicidal when roaming (especially Zone4)