Your phone is working as designed. Changes were made in iOS 11 as to how Control Centre operates.
Use Bluetooth and Wi-Fi in Control Center with iOS 11 - Apple Support
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Newsroom Update
Apple is introducing a new Apple Watch Pride Edition Braided Solo Loop, matching watch face, and dynamic iOS and iPadOS wallpapers as a way to champion global movements to protect and advance equality for LGBTQ+ communities. Learn more >
Apple is introducing a new Apple Watch Pride Edition Braided Solo Loop, matching watch face, and dynamic iOS and iPadOS wallpapers as a way to champion global movements to protect and advance equality for LGBTQ+ communities. Learn more >
Your phone is working as designed. Changes were made in iOS 11 as to how Control Centre operates.
Use Bluetooth and Wi-Fi in Control Center with iOS 11 - Apple Support
Your phone is working as designed. Changes were made in iOS 11 as to how Control Centre operates.
Use Bluetooth and Wi-Fi in Control Center with iOS 11 - Apple Support
You have to turn it off in settings>wifi, not in control center
Everything is explained in link that stedman1 posted
WIFI AUTOMATICALLY TURNS ON