Yes, but you need to be very careful doing that. A number of organisations will see your caller ID is a UK number, and will not answer the call. I seem to recall that there are a number of entries on this forum that suggest you dial the prefix that hides your caller ID first. That way, the call will not show as a UK call. Caller ID between administrations is spotty to say the least - sometimes it "sort-of" works and other times it just announces 'Private Caller' (at least here in the US), so the organisation has no real way of knowing where you are calling from.