FRITZ!Box 6840 LTE Service - Knowledge Base

FRITZ!Box 6840 LTE Service

"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 your LTE provider 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. It 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 is/are displayed in the event log of the FRITZ!Box:

  • "No LTE network was found within range."
  • "LTE connection could not be established. Reason: network timeout."
  • "Could not establish LTE connection.
    Reason: EPS_SERVICES_NOT_ALLOWED_IN_THIS_PLMN"

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. Select "Internet connection" from the drop-down list.
  4. If the FRITZ!Box indicates that the LTE connection is established temporarily and drops repeatedly, follow the instructions in our guide FRITZ!Box reports that the LTE connection drops frequently.

2 Checking whether the LTE network is supported

The FRITZ!Box supports LTE networks in the 800 MHz, 1.8 GHz and 2.6 GHz frequency bands. The FRITZ!Box does not support other frequency bands.

Note:Information on the frequency band used in your local area can be obtained from your LTE 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. Pull the card holder completely out of the SIM card slot (see fig.).
  2. Check whether it is the mini-SIM (25 x 15 x 0.76 mm) SIM card you received from your LTE provider and that the contacts are not damaged.

    Important:You cannot use micro or nano SIM cards that have already been punched out or SIM cards intended for mobile connections according to the mobile standard UMTS/HSPA (3G).

    • If it is not the mini-SIM card you received from your LTE provider or the contacts are damaged, contact your LTE provider.
    • If it is the mini-SIM card you received from your LTE provider and the contacts on it are not damaged:
    1. Place the SIM card with the slanted edge in the bottom right corner with the contacts facing downwards.
    2. Insert the card holder with the SIM card back into the SIM card slot.

      Fig.: Inserting the SIM card

4 Activating your SIM card for use with the LTE network

The following step is only necessary if the FRITZ!Box displays the message "No LTE network was found within range" or "Could not establish LTE connection. Reason: [...]" although there are LTE networks within range displayed in the FRITZ!Box user interface under "Internet > LTE information > Network List":

  1. Have your LTE provider activate the SIM card for use with the LTE network.

5 Enabling roaming

The following step is only necessary if your LTE provider uses another provider's LTE 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".

    ATTENTION!Enabling roaming could result in additional costs. Information on roaming and possible costs can be obtained from your LTE provider.

  4. Click "Apply" to save the settings.

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

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

7 Checking the LTE antennas

Mistakes made when connecting the LTE antennas can often be overlooked. Therefore, check whether the LTE antennas were correctly connected to your FRITZ!Box:

  1. Check the pin in the connector of both LTE antennas. If the pin is bent or has broken off, there can be no contact between the LTE antenna and the FRITZ!Box.
  2. Make sure that both of the LTE antennas included in the package are correctly screwed onto the sockets labeled "LTE" on the FRITZ!Box.
  3. Swap the LTE antennas connected to the two LTE antenna sockets on the FRITZ!Box. Check whether the FRITZ!Box can then establish an LTE connection.
  4. If you are using an outdoor LTE antenna, check whether you can establish an LTE connection if you use a different outdoor LTE antenna or a different LTE antenna cable. If you can establish a connection then, either the outdoor antenna or antenna cable is not suitable or is defective.

    Note:If you are using the FRITZ!Box in the indoor coverage area of your LTE provider, test whether you can establish an LTE connection if you use the original LTE antennas included in the package.

8 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 LTE 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 mobile radio cell is located, place the FRITZ!Box by the wall facing the mobile 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. Place 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.
    4. Position the antennas of the FRITZ!Box so that they are as perpendicular as possible (90° angle). For example, position one antenna vertically and the other horizontally.

9 Connecting an outdoor LTE antenna

If you are using the FRITZ!Box in an area located on the edge of the LTE radio coverage area (outdoor coverage area), using LTE antennas in your house may not be sufficient to establish an LTE connection. In this case, increase the transmission and reception power of the FRITZ!Box by using an outdoor LTE antenna on your roof or balcony, for example:

Note:Your LTE provider can tell you whether you are using the FRITZ!Box in their indoor or outdoor coverage area.