@mie
iPhones and android phones with visual voicemail will send silent texts to register on networks.
These are usually free and unnoticed but can be charged for when overseas.
Turn off those services to prevent the charges.
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.
Please select the post that helped you best and mark as the solution. This helps other members in resolving their issues faster. Thank you.
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