In troubleshooting an issue with an internet connection disconnecting every time a phone call is received, there are a few steps to take first.

1. Check the strength of your router’s signal: Using an app such as WiFi Analyzer to get an overview of the signal strength and the location of your router.
2. Check if the phone line is connected: Make sure the wire is properly plugged in where it needs to be.
3. Check for interference: Make sure devices generating a lot of radio waves, such as microwave ovens, are not too close to the router.
4. Check the wireless channel: When setting up the WiFi network, make sure to select a channel that is not being used by any other networks.
5. Check the internet connection settings: Make sure you have the right IP address, subnet mask, gateway, and DNS Server settings.