How to divert a BT landline
Send calls from your BT office or home phone to your mobile or an answering service. BT's codes are slightly different from mobile ones: one star at the start, not two.
Checked 11 November 2026 against BT's own help page.
These are for a BT home or business phone line, not a mobile. Replace NUMBER with the number you want calls to go to. Pick up the landline, dial the code and listen for the announcement confirming it.
Divert calls you don't answer
*61*NUMBER#
BT diverts any call you don't answer within 15 seconds. Best for most trades: the office phone rings first.
Divert when the line is busy
*67*NUMBER#
If someone's already on the phone, the next caller is diverted.
Divert all calls
*21*NUMBER#
The landline won't ring at all. Handy when the office is closed.
Check a divert
*#61#
Use *#21# or *#67# to check the others.
Turn a divert off
#61#
Or #21# and #67# for the others.
I'm on BT Digital Voice. Is it different?+
The codes still work on phones plugged into your BT Hub. With a Digital Voice handset you can also use the menu: Calling Features, then Call Diversion, then Set Up, then enter the number.
Does BT charge for diverting?+
BT says Call Diversion itself is included for Digital Voice and Home Phone Standard customers. You pay for the diverted call itself, plus the normal call setup fee, at the same rate as calling that number from your landline, unless it's covered by your inclusive minutes. Diverting to a BT mobile or BT home phone is free; diverting to another mobile costs more than to a landline.
Can I use it with Call Barring?+
Yes, but BT says you must switch on Call Diversion first.
Business line or VoIP system?+
BT Business lines and hosted phone systems often set diverts in an online portal instead. CallVest customers: tell us what you've got and we'll set it up with you.
Related
Sources
BT is a trade mark of British Telecommunications plc. CallVest is not connected with BT.
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