FRITZ!Box 6840 LTE Service - Knowledge Base

FRITZ!Box 6840 LTE Service

Transmitting own telephone number (outgoing caller ID)

When you make calls, you can automatically transmit your telephone number (caller ID) to the person you are calling. The person you call can then see your telephone number in the display of their telephone.


  • The feature caller ID blocking on a call-by-call basis must have been enabled by your telephony provider.

Note:All instructions on configuration and settings given in this guide refer to the latest FRITZ!OS for the FRITZ!Box.

1 Preparations

  1. Enter #514*0*#91** on your telephone and press the call key (lift the receiver).
  2. Hang up again after about 3 seconds.

2 Transmitting your caller ID when using call through

If you configured "call through" in the FRITZ!Box and then use the function to make a call, your telephone number is not transmitted automatically. However, you can transmit the telephone number of the telephone line that your FRITZ!Box is connected to on a call-by-call basis (only for one call):

  1. Enter #31# before entering the telephone number you want to be routed to.

    Important:The number of the telephone line from which you call the FRITZ!Box cannot be transmitted.

3 Disabling caller ID blocking (CLIR)

To transmit your telephone number to the parties you call, you must disable caller ID blocking, or CLIR (Calling Line Identification Restriction) for short, in the FRITZ!Box or your telephone. The procedure depends on the type of telephone you are using:

Disabling caller ID blocking for analog and cordless telephones

  1. Click "Telephony" in the FRITZ!Box user interface.
  2. Click "Telephony Devices" in the "Telephony" menu.
  3. Click the (Edit) button for the respective telephone device.
  4. Click on the "Telephony Device Features" tab.
  5. Disable the option "Calling line identification restriction (CLIR)".
  6. Click "OK" to save the settings.

Disabling caller ID blocking for IP telephones

  1. Disable caller ID blocking directly on the IP telephone. Refer to the device's manufacturer for information on how to set it up, for example consult the manual.

    Note:You can disable caller ID blocking (CLIR) in FRITZ!App Fon by tapping "More > Settings > Tel. No. Suppressed".