FRITZ!Box 6850 LTE Service - Knowledge Base

FRITZ!Box 6850 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 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. 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 may be displayed in the event log of the FRITZ!Box:

  • "No LTE network was found within range."
  • "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 steps in our guide FRITZ!Box reports that the LTE connection drops frequently.

2 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 operator and that the contacts are not damaged.

    Important:Do not use any micro or nano SIM cards that have already been punched out and inserted into a SIM card holder because they can get jammed and damage the SIM slot.

    • If it is not the mini-SIM card you received from your mobile network operator or the contacts on the SIM card are damaged, contact your mobile network operator.
    • If it is the mini-SIM card you received from your mobile network operator and the contacts on it are not damaged:
    1. Insert the SIM card into the SIM card slot with the slanted edge of the card on the left and the contacts facing downwards.
    2. Push the SIM card into the SIM card slot until it clicks into place. A few millimeters of the SIM card protrude from the SIM card slot.

      Fig.: Inserting the SIM card

3 Configuring the FRITZ!Box

Enabling roaming

The following step is only necessary if you are not using the FRITZ!Box in Germany and your mobile network operator is using a different provider's network at your 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.

Selecting the type of mobile network

Depending on your mobile network operator and contract, if there are several radio cells at your location, you may need to manually select the desired type of mobile network in the FRITZ!Box:

  1. Click "Internet" in the FRITZ!Box user interface.
  2. Click "Account Information" in the "Internet" menu.
  3. In the section "Type of Mobile Network" ("Type of mobile communication"), enable the option "Manual" and disable the option "UMTS".
  4. Click "Apply" to save the settings.
  5. If you are now no longer able to connect to the mobile network, re-enable the option "UMTS" and click "Apply".

Selecting the LTE frequency band

Depending on your mobile network operator, at individual locations you may need to select the LTE frequency band in the FRITZ!Box manually:

Note:In Germany, the frequency bands 2.6 GHz, 1.8 GHz, and 800 MHz are used. Not all frequency bands are available at all locations, and not all LTE providers support all frequency bands.

  1. Click "Internet" in the FRITZ!Box user interface.
  2. Click "Account Information" in the "Internet" menu.
  3. In the section "LTE Frequency Band", enable the "Manual" option and disable all frequency bands except "2.6 GHz / band 7 (FDD)".
  4. Click "Apply" to save the settings.
  5. If the FRITZ!Box can establish a mobile connection using the frequency band you selected:
    1. Click "Internet" and then "LTE Information".
    2. Click on the "Mobile" tab.
    3. Check which speed is displayed in the "Throughput" line.
  6. Repeat steps 2 - 5 with the frequency bands "1.8 GHz / band 3 (FDD)" and "800 MHz / band 20 (FDD)", and use the frequency band the FRITZ!Box can achieve the highest throughput with.

4 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.

5 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 broadband 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.

6 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.