Hi, I recently switched to an Iphone 4. When one of my contacts ( Or anyone for that matter) calls me, it ALWAYS says 'Unknown'. Which is annoying because usually it's someone I have as a contact, but I never would know because it won't tell me. I have caller ID, but still it only says 'Unknown'. It's very, very annoying and I hope someone on here can help me figure out why it does that. (also, i have all my contacts numbers written in correctly, but it still happens) Help mee.