Wifi not connecting unless I'm close to the router
My phone only connect to Wi-Fi when close to the router
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The signal strength is not strong enough?
Check Wi-Fi - router settings -> see the following Apple articles:
Connect to Wi-Fi on your iPhone, iPad, or iPod touch
Connect to Wi-Fi on your iPhone, iPad, or iPod touch - Apple Support
If your iPhone, iPad, or iPod touch won’t connect to a Wi-Fi network
If your iPhone, iPad, or iPod touch won't connect to a Wi-Fi network - Apple Support
Recommended settings for Wi-Fi routers and access points
Recommended settings for Wi-Fi routers and access points - Apple Support
If you need help with your Wi‑Fi password
If you need help with your Wi‑Fi password - Apple Support
If you and your neighbors set WiFi to the same channel, they can interfere with each other. It is best to choose channel 1, 6 or 11. These do not overlap and therefore disturb each other as little as possible. You can use various apps to see which networks are active in your area, in order to choose the best channel for your own WiFi.
It is best to choose a WiFi scanner on a smartphone, so that you can measure WiFi activity in all places where you want to use WiFi.
See -> Network Analyzer - iOS