A friend sent me my iphone4 from England, and they aren't available here in South Africa yet, so no accessories, support...I have even battled to get a micro sim! Anyway, I am up and running, and loving the apps side of things, but battling with the phone side- I know I am meant to be introducing myself here, but can I ask a quick question...? Why do all incoming calls come up as "unknown caller" regardless of whether they come from a contact who is already there, or a first time caller, who has NOT hidden their caller ID?