My WiFi is greyed out and WiFi didn't work what should I do
Why my WiFi is greyed out WiFi didn't work
iPhone 8 Plus, iOS 15
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Optimize the range of the mobile network, see this Apple article:
If you see No Service or Searching on your iPhone or iPad
If you see No Service, Searching, or SOS on your iPhone or iPad - Apple Support
See -> If you can't activate your iPhone or iPad (Wi-Fi + Cellular)
If you can't activate your iPhone or iPad (Wi-Fi + Cellular) - Apple Support