Network Services are available on BT's digital exchanges (System X and System Y) and are usually available on the payment of a quarterly rental, though some are available solely on the payment of a per usage charge.

SUMMARY ONLY

Set up features:

5 ==                    Retry When Not Busy (when busy tone heard) [System Y]
*21*number#             Call Diversion (all calls)
*261#                   Call Barring (incoming)
*34bar#                 Call Barring (outgoing
*40*number#             Call Charge Advice [System X]
*40*number              Call Charge Advice [System Y]
*411#                   Call Charge Advice on all calls
*43#                    Call Waiting
*51*code*number#        Code Calling
*55*time#               Reminder Call
*56*time*programme#     Reminder Programme [System X]
*61*number#             Call Diversion (no reply)
*61*number*wait# ==     Call Diversion (no reply) [Extra System Y facility]
*67*number#             Call Diversion (on busy)

Calling code calls:

**0                     Repeat Last Call (excluding Calling Code calls)
**code                  Code Calling call

Status checks on settings:

*#001#                  Check which services are active [System X]
*#21#                   Call Diversion (all calls)
*#261#                  Call Barring (incoming)
*#34#                   Call Barring (outgoing)
*#411#                  Call Charge Advice on all calls
*#43#                   Call Waiting
*#51*code#              Code Calling
*#55#                   Reminder Call
*#56#                   Regular Programme [System X]
*#61#                   Call Diversion (no reply)
*#67#                   Call Diversion (on busy)

Cancel features:

#21#                    Call Diversion (all calls)
#261#                   Call Barring (incoming) [System X]
#261*keyword#           Call Barring (incoming) [System Y]
#34bar*keyword#         Call Barring (outgoing)
#37# ==                 Retry When Not Busy [System Y]
#411#                   Call Charge Advice on all calls
#43#                    Call Waiting
#51*code#               Code Calling
#55#                    Reminder Call
#56*time*programme#     Reminder Programme [System X]
#56#                    Reminder Programme [System X]
#61#                    Call Diversion (no reply)
#67#                    Call Diversion (on busy)