€ 0.20 was charged for a text to a number starting with 004477. What is this?

– Updated

This text message is linked to the use of the Apple application Facetime.

More info
Your iPhone will send a message (which is not shown in your outbox) to the UK, where the Facetime server is located. This connection with Facetime will always appear on your phone history as a paying text message. You can activate or deactivate Facetime on your device: Start screen > Settings > Telephone > Facetime (switch on or off).