Does your friend have the same type phone. may be the wifi network have different band? You can install
https://f-droid.org/repository/browse/?fdid=com.vrem.wifianalyzer
https://play.google.com/store/apps/details?id=com.vrem.wifianalyzer
Do not worry it is open-source software (no spyware). In this app, you can scan networks and see what networks, bands, channels, strength are available. Or install it in your friends phone find details.