Onbekend nummer op factuur

FaceTime Activation / Registration

FaceTime is activated by sending a couple of SMS text messages in the background between the iPhone and an Apple server. If your carrier does not officially support the iPhone, you may be charged for sending the activation SMS to an international (UK) number. Your carrier might also have issues delivering the SMS correctly which will prevent FaceTime from activating.

After enabling FaceTime in iPhone settings, your iPhone will attempt to send a "silent text message" (i. e. a text you don't know about) to Apple, that registers your telephone number on Apple's servers used for FaceTime. Apple then returns a "silent coded text message" to your iPhone, that activates the FaceTime within iOS4 and later.

FaceTime activation currently requires the iPhone to be activated, have an active SIM card with the ability to send and receive SMSes. If there's an issue sending or receiving SMS messages, FaceTime can't be enabled or activated.
FaceTime Registration Request

The iPhone sends a Registration Request SMS silently to this UK number (as identified by the +44 country code): +44 7786 205094. AT&T customers have their own local number for FaceTime activations: 28818773.  In Bell and Telus carrier bundles, version 7.2 the number is: 49988.