FRITZ!Box 3370 Service - Knowledge Base

FRITZ!Box 3370 Service

Setting up FRITZ!Box for Internet access via the mobile network

If you use an additional mobile broadband dongle with the FRITZ!Box, the FRITZ!Box can also connect to the Internet using the mobile network and then provide Internet access to all computers in the home network.

Note:If you do not have a mobile broadband dongle, you can also configure the FRITZ!Box to use the mobile Internet connection of an Android smartphone (USB tethering).

Requirements / Restrictions

  • The mobile broadband dongle must support the mobile standard LTE (4G) or UMTS/HSPA (3G).
  • The mobile broadband dongle must support the AT command set or USB tethering.
  • Depending on the mobile network operator, Internet telephony and all other functions for which a public IP address is required (for example incoming VPN connections) are either available or available only to a limited extent.

Note:The configuration procedure and notes on functions given in this guide refer to the latest FRITZ!OS for your FRITZ!Box.

1 Connecting a mobile broadband dongle to the FRITZ!Box

  • With the SIM card inserted, connect the mobile broadband dongle to a USB port on the FRITZ!Box.

    Important:According to the USB specifications, the power consumption of a USB device may not exceed 500 mA. If the dongle requires more than this, connect it to the FRITZ!Box by means of a USB hub with its own power supply (active USB hub). Refer to the manufacturer of the dongle for information on its power consumption.

2 Configuring the FRITZ!Box


  1. Click "Internet" in the FRITZ!Box user interface.
  2. Click "Mobile Communications" in the "Internet" menu.
  3. Check whether the section "USB Tethering" is displayed.

Configuring the Internet connection

  1. Click "Internet" in the FRITZ!Box user interface.
  2. Click "Mobile Communications" in the "Internet" menu.
  3. If you would like to always connect to the Internet using the mobile network:
    • Enable the option "Mobile connection enabled".
    • If you only want the Internet connection to be established using the mobile network when DSL synchronization is interrupted:
    • Enable the option "Automatically enable the mobile connection when the DSL connection is disrupted".

      Note:Once the DSL connection has been stable and available again for 30 minutes, the FRITZ!Box clears the mobile connection and switches the Internet connection back to DSL.

  4. Enter the PIN for the SIM card of the mobile broadband dongle in the "PIN" field.

    Important:If you enter the wrong PIN three times, you must enter the PUK. Your mobile network operator can provide you with information on your PIN or PUK.

  5. Select your provider from the drop-down list "Mobile communications network provider",
    • or, if your mobile network operator is not included in the list:
      • Select "Other operator" and enter the account information you received from your mobile network operator in the corresponding fields.

        Note:You cannot change the account information for pre-configured mobile network operators.

  6. Click "Apply" to save your settings.

The FRITZ!Box now establishes all Internet connections using the mobile broadband dongle connected to it.