Why did my phone use data when I was connected to Wi-Fi?

If you have mobile data enabled, data can still be used when on Wi-Fi for certain features such as FaceTime and MMS that use the mobile network to send and receive video and images.

If you wish to avoid this, ensure mobile data is disabled whenever you choose to be solely using Wi-Fi.

Please note, this will restrict certain features such as MMS until mobile data is enabled again.

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