€ 0.07 was charged for a text to a number starting with 004477. What is this?

TL;DR
This text message is linked to the use of the Apple application Facetime or iMessage. It should be free of charge, so please call our helpdesk for free using the number 1976 or send us a message.

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