WiFi Channel Scanner iPhone/iPad

Download the Airport Utility app

Once downloaded go to setting then scroll down to the Airport Utility app and enable Wi-Fi Scanner

Return back to the app, you will now see a Blue colored Wi-Fi Scan in the top right of the app.

Click  Wi-Fi Scan

This will display all the neighboring WiFi routers in the area.

You will can now change your personal router to an unused channel this will help eliminate problems with WiFi connections/dropouts.

Also see : Choosing the best Wi-Fi channel : https://lozaelec.blogspot.com/2016/12/choosing-best-wi-fi-channel.html