How to set default wi-fi connection

[The Wingco]

50% of the time my phone tries to connect to the ubiquitous BTWifi-with-FON instead of my home router. I've tried deleting BT from the list to no avail. Any suggestions out there please

 

[Harrie-S]

Welcome to Windows Central,

BTWifi-with-FON looks like a (free) wifi hotspot.

In settings > wifi > Wifi sense there is an option to automatically connect to wifi hotspots. Unmarking this box will prevent that your phone connects to this wifi network.