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Telephoning in general
With the new phones and with the app, an outside line is no longer necessary, but you type in the destination number without the previously preceding 0, e.g. 0151-2255667788 or 040-999887766.
Yes, with one exception, telephone numbers in Witten must be entered with the area code of Witten, e.g. 02302 556677.
Go to "Tools", "Automatic answer and call forwarding", select your number and enter the call number to be forwarded to in the lower selection field. Confirm with OK and the call forwarding is immediately active.