We wish to highlight that this is a common charge incurred by iPhone users. The explanation is provided as follows:
iPhone users may be charged by Apple for activation request* sent to Apple Servers (in UK) each time you:
- Turn on/off iMessage function
- Turn on/off FaceTime function
- Insert SIM card into iPhone (each removal/insertion of SIM will trigger request for iMessage)
*Activation request is sent via GlobalSMS @$0.18/sms to Apple Servers; including but not limited to the following UK numbers:-
You may refer to Apple Support at https://support.apple.com/en-ph/HT201349
for more details.