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Knowledge document #334
FRITZ!Box 6591 Cable
This support document is available for the following products:

Telephone numbers cannot be entered or edited

The settings for the telephone numbers entered in the FRITZ!Box cannot be edited or you cannot set up new telephone numbers.

Simply proceed as described below. After each measure, check whether the problem is solved.

1 Maximum number has been reached

A maximum of 20 internet telephone numbers can be entered in the FRITZ!Box. If 20 internet telephone numbers were already configured, you cannot set up any more internet telephone numbers.

2 Enabling the Advanced View

Some settings are not displayed when the Standard View of the user face is selected:

  1. Open the FRITZ!Box user interface.
  2. Click on the three-dot icon in the upper-right corner of the user interface.
  3. Click the on/off switch to enable the Advanced View.

    Fig.: Enabling the Advanced View

    • The advanced view is enabled when the on/off switch is green.  .

3 Only the provider can make changes

With some cable providers, the telephone numbers are automatically configured in the FRITZ!Box when the internet connection is configured. With these providers, it is not possible to later change the settings for telephone numbers that were configured automatically or enter additional telephone numbers in the FRITZ!Box.

Refer to your cable provider for information on entering and editing telephone numbers.