Siemens Gigaset A 200 Manual page 34

Cost-effective telephony
... then
[_________] [______________]
MENU
[______]
OK
Dialling with and without preselection (automatic call-by-call numbers)
The phone numbers entered are checked by your phone during dialling. Once the talk
key has been pressed, the first digits of the number dialled are compared with both lists:
If none of the entries in either list or in the "without preselection" list matches,
N
then no call-by-call number is prefixed. This also applies if the first digits of a phone
number have been entered in both lists by mistake.
Only if the first digits match an entry in the "with preselection" list is the call-by-call
N
number prefixed.
32
Select entry and press display key.
Enter or change the first digits of the phone number,
then confirm.
Long press (return to idle state).