Siemens Gigaset SL100 Instructions Manual page 36

Making cost-effective calls
Dialling with and without preselection (automatic call-by-call number)
Your telephone checks the numbers you enter as you dial. When you press the talk/
handsfree key the first digits of the number you have dialled are compared with both
lists:
If they match none of the entries on either list or if they match an entry on the list
◆
"without preselection", no call-by-call number will be placed in front of them. Not
even if the first digits of the number also match an entry in the list "with preselec-
tion".
If the first digits only match an entry in the list "with preselection", the call-by-call
◆
number will be placed in front of the number you are dialling.
Temporarily cancelling preselection
¢ ¢
c v
If you want to permanently deactivate the preselection function, delete the number
saved.
35
Aut Preselct off