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T-Mobile HomeBox (Sagemcom Fast 5670) - Split SSID for 2.4GHz and 5GHz bands

Colsman123 64323 25
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Can I split the Wi‑Fi SSID of a T‑Mobile HomeBox (Sagemcom Fast 5670) into separate 2.4 GHz and 5 GHz networks myself?

You generally cannot do this yourself in the My T-Mobile app; users report that it only lets you rename/change the Wi‑Fi password for both bands together [#20566595] The working solution is to call the T-Mobile hotline and ask for the bands to be separated by a technician [#21223863] One user reported that after the call, support escalated it and the separation was done within about 5 minutes [#20748691] Another user said a single hotline call was enough to get two separate networks [#20670551]
AI summary based on the discussion. May contain errors.
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  • Need separate SSIDs for 2.4 and 5 GHz

    #1 20517377
    Colsman123
    Level 17  
    Posts: 330
    Help: 1
    Rate: 3
    Hello,
    For a few days now I have a T-Mobile fiber along with a HomeBox router (Sagemcom Fast 5670).
    How can I split the SSID into two bands transmitting in 2.4 and 5Ghz?
    Unfortunately, in the next room the speed drops from 300Mbps to 40-50Mbps as the devices connect in the 2.4Ghz band presumably considering the greater range. In the "My T-Mobile" app I only see the option to change the SSID name and password, but it says that the change will affect both bands.
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  • #2 20517489
    sosarek

    Level 43  
    Posts: 83875
    Help: 9320
    Rate: 15532
    Since there is no way to do this, you need to get another router.
    Company Account:
    Z
    Pka, Poznań, 60-850
    Helpful post? Buy me a coffee.
  • #3 20566266
    piotrwrb
    Level 11  
    Posts: 69
    Rate: 8
    >>20517377 In the previous HomeBox were separated, I can see it from the SSID of the neighbor networks no and you could configure through "My WiFi". In the current one practically nothing can be done.

    Added after 1 [minute]:

    sosarek wrote:
    Since it is not possible then you need to get another router.

    Can you advise what kind? Preferably a hardware only fiber optic plug would suffice. Can be budget :) P.

  • Use bridge mode or a standalone ONT

    #4 20566276
    KOCUREK1970
    Network and Internet specialist  
    Posts: 35667
    Help: 3861
    Rate: 5489
    piotrwrb wrote:
    Do you advise what kind? Preferably a hardware only fiber optic plug would suffice. It can be budget

    This is not how it works :D
    No other router with an integral ONT will work here.
    You buy your router, give HomeBox to bridge mode (if there is such a function there at all) and behind it you give your router.
    Or you fight with TMobile for a standalone ONT, login data and behind ONT you give your router.
  • #5 20566595
    trivial1
    Level 20  
    Posts: 274
    Help: 36
    Rate: 61
    T-Mobile does not give any option to change their hardware or give ONT , only built in router.... You are doomed to what is or try to advertise, there is already a second thread like this and the author gave up. I have my LAN and AP at home, so on their router I disabled wifi.
    Edit:
    There only through my t-mobile you can rename wi-fi, but not split into 2 bands.
  • #6 20567025
    piotrwrb
    Level 11  
    Posts: 69
    Rate: 8
    KOCUREK1970 wrote:

    Any other router with an integral ONT won't work here. You buy your router, put the HomeBox in bridge mode (if such a feature is there at all) and behind it you give your router.
    Or you fight with TMobile for a standalone ONT, login data and behind the ONT you give your router.


    And buying your own separate ONT?
  • #7 20567186
    KOCUREK1970
    Network and Internet specialist  
    Posts: 35667
    Help: 3861
    Rate: 5489
    piotrwrb wrote:
    and buying your own separate ONT?
    It won't work either. It won't work even the one someone from the operator will sell on Allegro.
  • #8 20618805
    exciter85
    Level 10  
    Posts: 6
    Rate: 4
    Of course it will work. I plugged in an Asus rt-ac570u v3 router, there was a bit of combining, but it worked out. Without a router from T-Mobile. If needed, I can help you set up the Asus.
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  • #9 20619002
    artaa
    Level 43  
    Posts: 15088
    Help: 1819
    Rate: 1700
    Please describe in detail the configuration of the jw.
  • #10 20619591
    KOCUREK1970
    Network and Internet specialist  
    Posts: 35667
    Help: 3861
    Rate: 5489
    exciter85 wrote:
    Of course it will work.
    Please read the QUESTION answered carefully. ONT is NOT a router - and the question was about your own ONT.

  • Independent ONT requires repeated hotline requests

    #11 20666461
    huberthancza
    Level 8  
    Posts: 5
    Rate: 2
    >>20566595

    July 24, 2023 - I got an independent ONT on request. It works like a clunk, you report it to the hotline, they laboriously write something down. After which, when the installer calls, he informs with disarming candor that he knows nothing, they do not get these comments, well I say that I want ONT, because he has to download, etc.

    Generally what you see on Youtube ads, for example, https://www.youtube.com/watch?v=JPr1XbLOgwU or https://www.youtube.com/watch?v=GMCAAtttrQk are moss and fern tales.

    Generally at every step you have to remind - I want ONT, I want ONT, I want ONT, I want ONT....
  • #12 20670551
    gorgiusz
    Level 10  
    Posts: 15
    Rate: 12
    I had a similar problem because my Wi-Fi printer and Wi-Fi bulb did not recognize the name of the network as 2.4 GHz. One phone call to the hotline and after a minute I had separated networks, I see no difference in performance.
  • #13 20690031
    sszczygielski1212
    Level 1  
    Posts: 1
    Rate: 1
    exciter85 I wrote on PW because I have a problem with this super internet like everyone else :)
    Let you know please what and how you set in config for ASUS
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  • Hotline request enabled separate 2.4 and 5 GHz SSIDs

    #14 20748691
    Asani
    Level 1  
    Posts: 1
    Rate: 1
    I had the same problem. I tried to change it myself in the settings, but it wasn't possible. The employee of the stationary salon told me to call the hotline, pretend to be a fool and say that I want the bands to be separated, because that's what the man in the office told me. And that I'm dissatisfied because the TV doesn't work for me :)

    That's what I did, the lady at the hotline didn't know what was going on, but said she would ask the technical staff. After waiting for a while, she came back saying that ok, the technicians are changing it, I will have the bands separated within 5 minutes. And so it happened. All internet problems are gone. I recommend this solution!

  • Disable Wi‑Fi on the T-Mobile router and use your own AP

    #15 20751158
    ntva
    Level 3  
    Posts: 15
    Rate: 4

    trivial1 wrote:
    T-Mobile does not allow any changes to its equipment and does not provide an ONT, only one built into the router. You are stuck with what is or try to advertise it. There is already a second thread like this and the author gave up. I have my own LAN and AP at home, so I turned off wifi on their router.
    Edit:
    There, only through my T-Mobile you can change the wi-fi name, but not split into 2 bands.

    Come on, don't write nonsense. Depending on what router with a built-in ONT you get these days, they give the Sagemcom Fast 5670 a solid (?) V2. You "manage" it through a funny application. I'm leaving out outdated and vulnerable, for example the kernel, but there is no problem with getting ONT from the technicians - you mention when they call.

  • T-Mobile app support came later

    #16 20751219
    trivial1
    Level 20  
    Posts: 274
    Help: 36
    Rate: 61

    @ntva
    Buddy, you are responding to a post from the beginning of May, and at that time T-Mobile did not offer anything via the application. I know because I just had the light installed.
    There was a discussion in another thread and I wrote there when the operator introduced the ability to configure the network in its router. After previous user complaints about this Sagem.
    With ONT, my answer was also based on the statements of other users of their lights, and I also asked the operator, on the hotline and at points, and they were not able to answer clearly.
    I missed the fight for ONT because I had my own network and AP, so Sagem only acted as a modem.
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  • #19 21223863
    maciek784
    Level 1  
    Posts: 1
    Rate: 2
    Band splitting can be done by a T-Mobile technician - it is necessary to contact the helpline as this cannot be done yourself.
  • #20 21228810
    krzysztofletkiewicz
    Level 1  
    Posts: 1
    >>20517489 .
    I have two bands at my place, but the T-Mobile magicians did it

  • Bypassing HomeBox with ONT, PPPoE, VLAN 35, and MAC clone

    #21 21470578
    DawidMisiak
    Level 11  
    Posts: 43
    Rate: 8
    I've read up on the forums, poked around in the router settings and yes, I confirm that it is possible to 'knock out' the Home Box and connect your own router to the ONT.

    1) Connect the ONT to the WAN port on the router (some routers detect by themselves where the WAN is connected, but I set a specific physical port on the router as the WAN).
    (2) In the WAN settings on the router, look for the field with the selection of the WAN connection type described as PPPoE. Usually, Automatic DHCP is selected here by default in the router.
    3. enter the username and password for the fixed-line internet. The username is the service number in the contract (in my case it starts with FTTH1XXXXXX), and it's best to call the BOK for the password (it's not in the contract anyway).
    4) We select the VLAN ID option for Internet 35. On one router I had to additionally select the 802.1q tag option, but on the other I didn't have this option, and it still works.
    5 We clone the MAC address from the Home Box to the router.
    6. we restart the ONT and the router and wait for the connection to be established.

    I tested on a Cudy WR1300E v.1 and a Xiaomi Mesh AC1200. On both it worked.

  • Own ONT or SFP module can replace operator box

    #22 21504554
    triodak
    Level 12  
    Posts: 27
    Help: 1
    Rate: 11
    Setting up your own router instead of a Home Box or other equipment from the operator with a little bit of willingness is possible. The only thing you need to take care of is the GPON ONT terminal at installation.

    KOCUREK1970 wrote:
    piotrwrb wrote:
    and buying your own separate ONT?
    .
    It won't work either.
    It won't even work if someone from the operator sells it on Allegro.


    In general, we are not limited to ONTs from a supplier/operator. You can also have your own ONT or optical insert / SFP module in your own router.
    You have to flash some data to make the 'operator's' network communicate with our equipment. It is important that the terminal or insert has this possibility. There are also inserts where you can simply configure them.

    Tips on how to do this are in the second part of my post .
    A few YT videos will illuminate the subject which does not mean that everything is already given on a platter.

    #gpon #ont #router #netia #orange #play #plus #t-mobile #vectra
  • #23 21504643
    KOCUREK1970
    Network and Internet specialist  
    Posts: 35667
    Help: 3861
    Rate: 5489
    @triodak
    Just be aware that you are breaking the operator's terms and conditions or hacking into the operator's network with such actions.
    The operator may also block such equipment.
  • #24 21504673
    Anonymous
    Level 1  
  • #25 21504679
    KOCUREK1970
    Network and Internet specialist  
    Posts: 35667
    Help: 3861
    Rate: 5489
    Erbit wrote:
    Other than that, the impossibility of substitution is incompatible with some EU directive.

    Correct.
    The principle of net neutrality in the European Union is set out in Regulation (EU) 2015/2120.

    But here it talks in the advice about replacing completely all the operator's equipment.

  • Operator terms and prepaid balance refund note

    #26 21504737
    triodak
    Level 12  
    Posts: 27
    Help: 1
    Rate: 11
    KOCUREK1970 wrote:
    @triodak
    Just be aware that you are breaking the operator's terms and conditions or hacking into the operator's network with such actions.
    The operator may also block such equipment.

    I agree and assume this is a clear obvious to all. Especially if someone was using it to speed up the internet for themselves.

    I suspect that at least 99.9% of users who get plug & play equipment expect convenience and that the operator will take care of everything for them.
    Again, the operator doesn't want the costs (man hours) for nonsense repairs, i.e. unnecessary requests. The more they block everything, while allowing themselves (the technical departments) full remote control and access, the cheaper it is to maintain it all (i.e. cheaper offers).

    One person in a thousand has more knowledge, need or expectation and it starts to become a problem.
    What you can and can't, the operators don't tell you, lest by chance 99.9 per cent start asking about some option there, because it's wasted money by talking to the office staff for longer or more.

    My post was not intended to be educational with a wink ;-) .
    It was simply intended to give some better discernment of the subject for that 0.1%.

    I myself, for example, have only known for a week that when transferring a "prepaid" number to another operator's subscription, I can request a refund of the remaining balance in my account. Because some law was passed on the subject.
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Topic summary

LABEL_AI_GENERATED
The T-Mobile HomeBox router (Sagemcom Fast 5670) does not natively support splitting the SSID into separate 2.4 GHz and 5 GHz bands via the "My T-Mobile" app, which only allows changing the SSID and password for both bands simultaneously. Users seeking to separate bands for improved performance often face limitations due to the integrated ONT and router design provided by T-Mobile. The operator typically does not offer standalone ONT devices, and attempts to replace or bypass the HomeBox with third-party ONTs or routers require technical steps such as enabling bridge mode or obtaining ONT credentials (PPPoE username, password, VLAN ID 35). Some users have successfully connected external routers like the Asus RT-AC570U v3 behind the HomeBox or ONT to manage band separation and advanced configurations. However, this often involves complex setup, potential violation of operator terms, and requires contacting T-Mobile support or technicians to enable band splitting remotely. Recent reports indicate that T-Mobile technicians can activate band separation upon request via hotline support. The discussion also highlights the challenges of obtaining independent ONTs and the legal and technical considerations of replacing operator equipment. Video tutorials and community-shared configurations assist users in setting up third-party routers with T-Mobile fiber connections.
AI summary based on the discussion. May contain errors.

FAQ LABEL_AI_GENERATED

TL;DR: 15 forum answers show one practical fix: “call the hotline” and ask T-Mobile technicians to split the HomeBox Sagemcom Fast 5670 SSID into 2.4 GHz and 5 GHz networks. This FAQ is for T-Mobile fiber users whose devices fall from 300 Mbps to 40–50 Mbps on the combined Wi-Fi name. [#20748691] Why it matters: A combined SSID can push phones, TVs, printers, and IoT devices onto the wrong band, reducing speed or blocking setup.

Setup Wi-Fi control Hardware control Thread outcome
HomeBox Sagemcom Fast 5670 only Low in app Low Hotline technician can split bands
HomeBox plus own AP/router High on own device Medium Disable HomeBox Wi-Fi and use own LAN/AP
Standalone ONT plus own router High High Requires ONT request or correct PPPoE/VLAN setup
Own ONT/GPON module High High-risk May breach terms or be blocked

Key insight: The Sagemcom Fast 5670 usually does not expose SSID band splitting to the user. The cleanest route is a T-Mobile technical change, not a hidden app setting.

Quick Facts

  • The original speed drop was from about 300 Mbps to 40–50 Mbps when devices selected 2.4 GHz instead of 5 GHz in the next room. [#20517377]
  • In early posts, the My T-Mobile app allowed changing Wi-Fi name and password, but the change applied to both bands. [#20517377]
  • Users later reported successful band separation by hotline or technicians, including cases resolved in about 5 minutes. [#20748691]
  • For own-router operation behind a standalone ONT, one user listed PPPoE, VLAN ID 35, 802.1q tagging where needed, and MAC cloning. [#21470578]
  • Devices named in working user configurations include ASUS RT-AC57U v3, Cudy WR1300E v.1, and Xiaomi Mesh AC1200. [#21470578]

How to split the SSID into separate 2.4 GHz and 5 GHz Wi-Fi networks on a T-Mobile HomeBox Sagemcom Fast 5670?

Ask T-Mobile support to have a technician separate the 2.4 GHz and 5 GHz SSIDs. Users reported that the HomeBox Sagemcom Fast 5670 settings and app did not expose this option. One September 2023 report says technicians applied the split within 5 minutes after a hotline request. Use clear wording: “I want separate 2.4 GHz and 5 GHz Wi-Fi names on my HomeBox.” [#20748691]

Why do devices connected to a T-Mobile HomeBox switch to 2.4 GHz and get much lower speeds than on 5 GHz?

Devices choose 2.4 GHz because it often has stronger range than 5 GHz through walls. In the reported case, speed dropped from 300 Mbps to 40–50 Mbps in the next room. A combined SSID lets the client decide the band. That can favor signal strength over throughput, especially for phones, TVs, and older Wi-Fi devices. [#20517377]

What options does the My T-Mobile app provide for changing Wi-Fi name and password on the Sagemcom Fast 5670?

The My T-Mobile app allowed changing the Wi-Fi SSID and password, but applied changes to both bands. The original user saw no separate 2.4 GHz and 5 GHz controls in the app. Another user later confirmed that renaming Wi-Fi was possible there, but splitting into 2 bands was not available from the user interface. [#20566595]

How to ask T-Mobile support to separate the 2.4 GHz and 5 GHz bands on a HomeBox router?

Call the hotline and explicitly request separation of the 2.4 GHz and 5 GHz Wi-Fi bands. 1. Say devices fail or perform poorly on the combined SSID. 2. Ask for technical staff to split the bands remotely. 3. Wait for the router to update, then reconnect devices to the chosen SSID. One user reported full resolution within 5 minutes. [#20748691]

What should I do when a Wi-Fi printer, smart bulb, or TV cannot connect to the combined SSID on a T-Mobile HomeBox?

Ask T-Mobile to split the SSID, then connect those devices to the 2.4 GHz network. One user had a Wi-Fi printer and smart bulb that did not recognize the combined network as 2.4 GHz. After one phone call to the hotline, the user had separated networks within about 1 minute. This fixes compatibility without replacing the HomeBox. [#20670551]

What is an ONT in a fiber internet installation, and how is it different from a router?

Use an ONT as the fiber termination device, not as the Wi-Fi router. "ONT is a fiber-network terminal that connects the optical provider line to customer equipment, while a router manages local network, WAN login, Wi-Fi, and LAN routing." In the thread, one expert corrected that an ONT is not a router after an ASUS configuration was discussed. [#20619591]

What is bridge mode on a router, and how would it help when using your own router behind a T-Mobile HomeBox?

Bridge mode would let the HomeBox pass the connection to your own router. "Bridge mode is a router operating mode that disables or bypasses routing functions, allowing another router behind it to handle WAN connection, LAN addressing, firewall rules, and Wi-Fi." A user suggested HomeBox bridge mode only if that function exists there. [#20566276]

HomeBox with built-in ONT vs standalone ONT plus own router — which setup gives more control over Wi-Fi and LAN settings?

A standalone ONT plus your own router gives more Wi-Fi and LAN control. With the HomeBox alone, users described limited app management and no local band-split option. With own LAN and AP, one user disabled HomeBox Wi-Fi entirely. With a standalone ONT, another user ran a router directly using PPPoE and VLAN ID 35. [#21470578]

How to configure an ASUS router to work with T-Mobile fiber instead of the HomeBox?

Configure the ASUS as the main router only when you have an ONT or a compatible setup. A user reported success with ASUS RT-AC57U v3 without the T-Mobile router, after “a bit of combining.” Later, the same user pointed to a configuration video rather than posting full settings. The thread does not provide ASUS menu-by-menu steps. [#20618805]

What PPPoE username, password, VLAN ID, and MAC cloning settings are needed when replacing a T-Mobile HomeBox with your own router?

Use PPPoE, VLAN ID 35, the service-number username, the BOK-provided password, and HomeBox MAC cloning. One user’s username started with FTTH1XXXXXX. They selected PPPoE instead of Automatic DHCP, enabled 802.1q tagging on one router, cloned the HomeBox MAC address, and restarted both ONT and router. They tested Cudy WR1300E v.1 and Xiaomi Mesh AC1200 successfully. [#21470578]

Why might a privately bought ONT or GPON SFP module fail to work on T-Mobile fiber?

A private ONT can fail because the operator network expects provisioned optical equipment and matching data. In May 2023, a user warned that even an operator-origin ONT bought on Allegro would not work. Later posts say custom ONTs or SFP modules may work only after flashing required data, and the operator may still block equipment. [#21504643]

What is GPON, and why does it matter when replacing operator fiber equipment?

GPON matters because the optical terminal must communicate correctly with the operator’s fiber network. "GPON is a passive optical fiber access system that links subscriber terminals or SFP optical modules to the operator network, requiring compatible identifiers and provisioning data to establish service." One user noted that an ONT or optical insert must allow configuration or flashing. [#21504554]

How to request a standalone ONT from T-Mobile during fiber installation or technician visit?

Request a standalone ONT repeatedly during ordering, hotline contact, and the technician call. One July 24, 2023 report says the user received an independent ONT only after insisting: “I want ONT” at each step. The installer reportedly did not receive the hotline notes, so the customer had to repeat the request directly. [#20666461]

What risks are involved in flashing ONT data or using your own GPON optical module on an operator network?

The risks include violating operator terms, being blocked, and misconfiguring the fiber terminal. One user warned that flashing data or replacing all operator equipment may break the operator’s rules. Another cited EU Regulation 2015/2120 in a neutrality discussion, but the thread still flags operator blocking as a real edge case. [#21504679]

What router alternatives mentioned by users, such as ASUS RT-AC57U v3, Cudy WR1300E, and Xiaomi Mesh AC1200, work with T-Mobile fiber configurations?

Users mentioned ASUS RT-AC57U v3, Cudy WR1300E v.1, and Xiaomi Mesh AC1200 as working in specific T-Mobile fiber configurations. The ASUS RT-AC57U v3 reportedly worked without the T-Mobile router after custom setup. Cudy WR1300E v.1 and Xiaomi Mesh AC1200 worked with ONT, PPPoE, VLAN ID 35, and MAC cloning. [#21470578]
AI summary based on the discussion. May contain errors.
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