Wi-Fi Assist - iOS 11
Wi-Fi assist uses your mobile data when your Wi-Fi connection is poor. However this may and can use up a lot of your mobile data without you evening knowing it.
To turn this off go to Settings > Mobile Data then scroll all the way down to 'Wi-Fi Assist' then turn this off.
'Mobile OS tip of the week' is a complimentary service. You're advised to use at your own discretion and risk.
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