@barbcarp
You should not be using any mobile data if connected to your home wifi, but phones can still use mobile data if the wifi is weak or drops out.
Best to turn off mobile data in phone settings to prevent this if it's an issue for you.
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.
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