Can't connect to WiFi on my iPhone
unable to connect wifi
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Try to optimize the range of the mobile network, sSee this Apple article:
If you see No Service or Searching on your iPhone or iPad
https://support.apple.com/en-us/HT201415
For Wi-Fi see the following Apple articles:
Connect to Wi-Fi on your iPhone, iPad, or iPod touch
https://support.apple.com/en-us/HT202639
If your iPhone, iPad, or iPod touch won’t connect to a Wi-Fi network
https://support.apple.com/en-us/HT204051
Recommended settings for Wi-Fi routers and access points
https://support.apple.com/en-us/HT202068
If you need help with your Wi‑Fi password