Yes. If you reboot an iOS phone, and then call it without ever entering the passcode before, it will display the phone number but not look it up, because contac

Yes. If you reboot an iOS phone, and then call it without ever entering the passcode before, it will display the phone number but not look it up, because contacts are encrypted. The encryption class here is "locked until first unlock", so they stay unlocked afterwards not to disrupt basic expected user functionality. The whole security design is still much better as many other things stay completely locked.