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Power LED flashes

The FRITZ!Box's Power LED flashes? ✔ Here you can find out what this means and how to solve the problem.

Your FRITZ!Box establishes a connection to the mobile network as soon as you insert your SIM card and enter the PIN in the FRITZ!Box user interface. This can take up to 2 minutes. During this time, the Power LED on the FRITZ!Box flashes and then stays lit as soon as the connection has been established.

This guide shows you how to resolve the following error:

  • The FRITZ!Box's Power LED flashes continuously and you cannot connect to the internet.

One or several of the following error messages may be displayed in the event log of the FRITZ!Box:

  • "No LTE network was found within range."
  • "Could not establish LTE connection.

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

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

1 Checking the event log of the FRITZ!Box

  1. Click "System" in the FRITZ!Box user interface.
  2. Click "Event Log" in the "System" menu.
  3. Click on the "Internet Connection" tab.
  4. If the FRITZ!Box indicates that the mobile connection is established temporarily and drops repeatedly, follow the steps in our guide FRITZ!Box reports that the mobile connection drops frequently.

2 Checking whether the LTE network is supported

The FRITZ!Box supports LTE networks in the 800 MHz and 2.6 GHz frequency bands. The FRITZ!Box does not support other frequency bands.

Note:The FRITZ!Box does not support the 1.8 GHz frequency band used by some providers in some areas, for example. Information on the frequency band used in your local area can be obtained from your mobile network provider.

3 Checking your SIM card

Although it may not appear to be the case, your SIM card may have been inserted incorrectly, it may be damaged, or it may be the incorrect SIM card. Therefore, check the SIM card in the FRITZ!Box:

  1. Press the SIM card briefly to remove it from the SIM card slot.
  2. Check whether it is the mini-SIM (25 x 15 x 0.76 mm) SIM card you received from your mobile network provider and that the contacts are not damaged.

    Important:You cannot use micro or nano-SIM cards that have already been punched out and inserted into a SIM card tray or SIM cards intended for mobile connections according to the mobile standard 3G (UMTS/HSPA). SIM card trays can get jammed and damage the SIM slot.

    • If it is not the mini-SIM card you received from your mobile network provider or the contacts on the SIM card are damaged, contact your provider.
    • If it is the mini-SIM card you received from your mobile network provider and the contacts on it are not damaged:
    1. Pick up the FRITZ!Box so that you are facing the underside of the device and can read the "SIM Card" label on the SIM card slot.
    2. Insert the SIM card into the SIM card slot with the slanted edge of the card on the left and the contacts facing downwards (see fig.).
    3. Push the SIM card gently into the SIM card slot until it clicks into place. A few millimeters of the SIM card protrude from the SIM card slot.
      Inserting the SIM card

4 Enabling roaming

The following step is only necessary if your mobile network provider is using a different provider's network at the FRITZ!Box's location:

  1. Click "Internet" in the FRITZ!Box user interface.
  2. Click "Account Information" in the "Internet" menu.
  3. Enable the option "Permit roaming". If the option is not displayed, enable the Advanced View first.

    ATTENTION!Enabling roaming could result in additional costs. Refer to your mobile network provider for information on roaming and possible costs.

  4. Click "Apply" to save the settings.

5 Installing the latest FRITZ!OS for the FRITZ!Box

Installing the latest FRITZ!OS makes your FRITZ!Box compatible with the latest mobile network technology used by mobile network providers in their radio cells:

6 Finding the ideal location for the FRITZ!Box

You can use the alignment aid to find the ideal location for the FRITZ!Box and the best position for the mobile network antennas:

  1. Click "Internet" in the FRITZ!Box user interface.
  2. Click "LTE Information" in the "Internet" menu.
  3. Click on the "Reception" tab.
  4. Click the "Start Alignment Aid" button.
    • Now the current signal strength of the antennas is displayed by the LEDs on the FRITZ!Box (in five levels) and in the user interface.
  5. Select a location for the FRITZ!Box where the signal strength is as high as possible. When doing so, note the following:
    1. Do not set up the FRITZ!Box in the corner of a room.
    2. Place the FRITZ!Box as close to an outside wall as possible. If you know where your provider's LTE radio cell is located, place the FRITZ!Box by the wall facing the LTE radio cell.

      Important:If you place the FRITZ!Box in the attic or on a window sill, make sure that the permissible operating temperature of 0° to 40° Celsius is not exceeded.

    3. Position the FRITZ!Box so that it is as unobstructed as possible, i.e. not directly in back of or under an obstacle such as pieces of furniture or a heater.

7 FRITZ!Box is unsuitable for use in LTE outdoor coverage area

If you are using the FRITZ!Box in an area located on the edge of the radio coverage area (outdoor coverage area) of your mobile network provider, using the integrated mobile network antennas may not be sufficient to establish a radio connection. Therefore, the FRITZ!Box cannot solve this problem.

Note:Some FRITZ!Box models allow you to connect an outdoor antenna, for balcony or roof, for example. These models are suitable for use in the outdoor coverage area. Refer to our sales team for information on these models. Your mobile network provider can tell you whether you are using the FRITZ!Box in their indoor or outdoor coverage area.