BT
This number is listed by BT on its own website (Customer service for home phone and broadband).
Source: “to contact us Phone us on 0800 800 150” (opens in a new tab). Checked 13 October 2026.
This could still be a scam call
Criminals can make their number look like a genuine one (this is called spoofing). If someone calls from this number and asks for money, bank details, a code or passwords, hang up. Then call BT back on a number you've found yourself, such as the one on their own website or on a letter or bill from them.