"Memorable phone numbers, plus cheap international calls - we've been providing customers the best value phone services since 1999"

BT Star Service Code Information

Service Description Service Code
Check which services are active [System X] *#001#
Charge advice (before call) *40* (Number)
Charge advice (All calls)*411#
Charge advice (During call) "R"(to hold call) *40#(Call will be reconnected)
Cancel all calls charge advice#411#
Reminder call*55*(Time in 24 hour format)#
Cancel reminder call #55#
Call Divert - all calls - activate *21*(Number to divert to)#
Call Divert - all calls - to check*#21#
Call Divert - all calls - to cancel#21#
Call Divert - on busy - to activate*67*(Number to divert to)#
Call Divert - on busy - to check*#67#
Call Divert - on busy - to cancel#67#
Call Divert - on no reply - to activate*61*(Number to divert to)#
Call Divert - on no reply - to check*#61#
Call Divert - on no reply - to cancel #61#
Call waiting on*43#
Call waiting off#43#
Call waiting - to check condition*#43#
Call waiting - to answer 2nd callerRecall + 2
Call waiting - remove beeps during callRecall + 0
Ring back (Number called is busy)5
Cancel ring back #37#
Caller display on*234#
Caller display off#234#
BT call-minder (voicemail)1571
Check last number that called1471
Release CLI 1470 + dialled number
Withhold CL141 + dialled number
Access "Choose to refuse"14258
Call barring on (outgoing)*341 + option number #
options are:
1 = allows 999 and operator
2 = allows 999 and local
3 = allows 999 and STD
4 = bars all operator calls
5 = bars *
6 = bars premium adult lines
7 = bars premium information lines)
Call barring off (outgoing)#341*(PIN code)#
Incoming calls barred off [System X] #261#
Incoming calls barred on*261#
Incoming calls barred off #261*(PIN code)#
Check which services are active [System X] *#001#
Call Diversion (all calls) *#21#
Call Barring (incoming)*#261#
Call Barring (outgoing)*#34#
Call Charge Advice on all calls*#411#
Call Waiting*#43#
Code Calling *#51*code#
Reminder Call*#55#
Regular Programme [System X]*#56#
Call Diversion (no reply)*#61#
Call Diversion (on busy)*#67#
Three way callingSet up your first call, then press "R" to put first your call on hold and set up second call, Pressing "R" then 3 will set up three way (conference) call.
To end the first call, use Recall + 3
To end the second call, use Recall + 7

Some of these services are chargeable on a "Per use" basis, others are subscribed services which BT would provide for an extra charge on your bill.