are you now connecting to BTWIFI/FON or your own home network BT.com is just a web page
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If it is that your device won't connect to BT you need to g o into your devices wireless settings and "forget" any connections to BTWifi-Fon.
If your device still doesn't automatically connect to your own home network via your BT Homehub you will need scan for your BHomehub and use the wireless passkey/password found on your Homehub's label to connect.
If however it is that when you are connected and when you open up your web browser and end up at the BTWifi_Fon page instead of te BT.Com page you need to click here https://home.bt.com/ and save it as either your home page or in your favourites.