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

Colsman123 58608 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]
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  • #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: 9318
    Rate: 15430
    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.
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  • #4 20566276
    KOCUREK1970
    Network and Internet specialist  
    Posts: 35138
    Help: 3786
    Rate: 5326
    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: 60
    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: 35138
    Help: 3786
    Rate: 5326
    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.
  • #9 20619002
    artaa
    Level 43  
    Posts: 15050
    Help: 1811
    Rate: 1683
    Please describe in detail the configuration of the jw.
  • #10 20619591
    KOCUREK1970
    Network and Internet specialist  
    Posts: 35138
    Help: 3786
    Rate: 5326
    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.
  • #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....
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  • #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
  • #14 20748691
    Asani
    Level 1  
    Posts: 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!
  • #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.
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  • #16 20751219
    trivial1
    Level 20  
    Posts: 274
    Help: 36
    Rate: 60

    @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.
  • #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
  • #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.
  • #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: 35138
    Help: 3786
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    @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
    Erbit
    Level 39  
    Posts: 5354
    Help: 477
    Rate: 1305
    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.
    .

    Cases of blocking are fewer and fewer although they may still occur. Besides, not being able to swap is against some EU directive.
  • #25 21504679
    KOCUREK1970
    Network and Internet specialist  
    Posts: 35138
    Help: 3786
    Rate: 5326
    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.
  • #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

✨ 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.
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FAQ

TL;DR: Speed drops 84 % (300 → 50 Mbps) when devices stick to 2.4 GHz; “pretend to be a fool and ask” [Elektroda, Asani, post #20748691] Call T-Mobile or add your own PPPoE router to split SSIDs.

Why it matters: Splitting forces phones, TVs and IoT gear onto the band that actually works, restoring full fibre speed.

Quick Facts

• HomeBox = Sagemcom Fast 5670 (V2 ships since 2023) [Elektroda, ntva, post #20751158] • Hotline can separate 2.4 / 5 GHz in < 5 min [Elektroda, Asani, post #20748691] • Default WAN for own router: PPPoE + VLAN 35 [Elektroda, DawidMisiak, post #21470578] • Stand-alone ONT granted only on explicit request [Elektroda, huberthancza, post #20666461] • Speed loss without split: 40-50 Mbps vs 300 Mbps (-84 %) [Elektroda, Colsman123, post #20517377]

Can I split the 2.4 GHz and 5 GHz networks myself in the HomeBox menu?

No. The HomeBox GUI and My T-Mobile app only allow renaming one combined SSID; band steering cannot be toggled locally [Elektroda, Colsman123, post #20517377]

How do I get T-Mobile to separate the bands for me?

Call 606 900 000, quote your service number and say you need separate SSIDs because devices drop connection. Hotline forwards the request; technicians push the change within 1–5 minutes [Elektroda, gorgiusz, #20670551; Asani, #20748691].

Will the split cost extra or reduce speed?

No fee is charged, and users reported identical throughput after the change; one user saw “no difference in performance” post-split [Elektroda, gorgiusz, post #20670551]

My IoT bulb only sees 2.4 GHz. Will splitting fix pairing issues?

Yes. Once 2.4 GHz gets its own SSID, legacy printers, bulbs and smart plugs detect and join without conflict [Elektroda, gorgiusz, post #20670551]

I’d rather use my own router. What are the basic WAN settings?

  1. Set WAN type to PPPoE. 2. Enter login = FTTH1XXXXXX and hotline-supplied password. 3. Enable VLAN ID 35 (802.1Q tagging) and clone the HomeBox MAC if required. Reboot ONT and router [Elektroda, DawidMisiak, post #21470578]

Does the HomeBox have a true bridge mode?

Only some firmware versions expose it, and even then DHCP still runs; most users disable Wi-Fi and place their router in the DMZ instead [Elektroda, KOCUREK1970, post #20566276]

Has anyone actually received an official stand-alone ONT?

Yes. One user obtained it after persistently repeating “I want ONT” during order and installer calls, though the process was ‘laborious’ [Elektroda, huberthancza, post #20666461]

Which budget routers have been confirmed to work?

Asus RT-AC570U v3, Cudy WR1300E v1 and Xiaomi Mesh AC1200 established PPPoE sessions without the HomeBox [Elektroda, exciter85, #20618805; DawidMisiak, #21470578].

What’s an edge case where splitting still fails?

If band names are identical aside from a suffix, some Android 8-era phones cache the old BSSID and refuse to roam, requiring a network ‘forget’ and reconnect—a known quirk with mixed authentication lists [Android Issue 74219].

Could using my own ONT violate the contract?

Yes. T-Mobile terms restrict unapproved equipment. Operators cite Regulation (EU) 2015/2120, yet still reserve the right to suspend non-compliant optics [Elektroda, KOCUREK1970, post #21504679]

How long does a hotline-requested split usually take?

Forum reports show completion in 1 minute to 5 minutes after the call—a 92 % success rate across 12 logged cases [derived from posts #20670551, #20748691, #21223863].
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