Sagemcom Fast 5688W Gateway

Find technical details, tutorial links, and other information about your Sagemcom Fast 5688W gateway.

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Meet your Sagemcom Fast 5688W Gateway

For more gateway steps, such as instructions on how to install your SIM or reset your gateway, check out our Tutorials. 


Front view of the Sagemcom Fast 5688W gateway


An image of the back of the Sagemcom gateway with arrows pointing to it's parts. In the middle of the gateway is the Label. Below that is the Data Port. Below the Data Port are two Ethernet Ports. Below the Ethernet Ports is the Power Button. Below the Power Button is the Power Port.

Reading the gateway label

The label on the back of your gateway includes information about the device and network. 

The default Wi-Fi network name and Wi-Fi password can be found below the IMEI barcode.

Sagemcom gateway label with outline around Wi-Fi name and password

Need help setting up your gateway or changing your default Wi-Fi name and password?

LCD Screen

Press the left or right arrow ( < or > ) on the LCD panel with your finger to move between screens. The illuminated dot on the bottom of the screen indicates where you are in the screen sequence.


  • The gateway displays up to five bars, indicating signal strength. 
  • The number of bars shown represents the strength of the gateway's current connection to the cellular network.
  • An 'X' indicates the gateway is not connected to the cellular network.


  • The number displayed indicates the number of devices currently connected to the gateway (including wireless and wired devices).
  • Use the T-Mobile Home Internet app to see and manage each connected device.

Language Settings

The gateway supports both English and Spanish on the LCD screen. To adjust this setting:

  1. From the Languages screen, select Change
  2. Select English or Espanol.
  3. Press (OK) button to set the language.


The Messages screen allows you to view the message contents by pressing < and > to scroll between messages. 

To delete a message:

  1. Press O (OK) on the panel to select VIEW MESSAGES and view unread messages.
  2. Select NEXT and read next message.
  3. Select DONE when you have read all messages.
  4. Select DELETE to delete a message.
  5. When prompted with a message asking you to confirm deletion, select YES to confirm.

You can block messages to your gateway through your T-Mobile account. See Message Blocking for details.


Notifications can appear at any time during gateway operation. Some are in response to an action you have taken, and others are related to network connection. 

Tech Specs

Technical details of the Sagemcom Fast 5688W Gateway



AC Adapter

100V - 240V

2.5A @ DC 15V

Dimensions (W x H)

4.92 x 8.46 in (125 mm x 215 mm)

Operating temperature range

0° – 50° C (32° F – 122° F)


  • Dual Band Wi-Fi 6 (802.11ax) with 4 x 4 MIMO
  • WPA2/WPA3 Wi-Fi Security
  • Ethernet plugs 2xRJ-45
  • USB Type C x 1 for regular power source
  • USB Type C x 1 for data and other USB port purpose
  • Maximum recommended devices: 64


  • 5G bands: n24, n41, n66, n71, n77
  • 4G LTE bands: B2, B4, B5, B12, B26, B41, B46, B66, B71
Broadcast Range
  • One gateway is enough to cover all areas of most average size homes.
  • The Wi-Fi signal travels about the same distance as any other Wi-Fi signal, which ranges depending on interference and obstructions, but we estimate it will be approximately 30 feet.

Firmware updates

  • Firmware updates are pushed out automatically when available. They can't be manually requested.
  • They're sent out in phases over a few weeks, so not all users get the update at the same time.
  • Updates happen between 1 am and 3 am PST; make sure your gateway is turned on during this time to get the update.
  • Do not restart the gateway when it’s updating. The gateway will automatically restart once the update is complete.

To check firmware version...

  1. From the T-Mobile Internet App, select MORE > Gateway information.
  2. Review the Firmware version.
Firmware version, fixes, and features of the Sagemcom Fast 5688W Gateway
Firmware version Fixes & features
1.2.90 Stabillity improvements
  • Security & stability improvements
  • Fix for Wi-Fi calling issue
1.2.74 Security and stability improvements
1.152 Security and stability improvements
1.00.14 Release version

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