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Telekom ONT with O2

  • January 23, 2026
  • 7 Antworten
  • 49 Aufrufe

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Hello O2,

Currently i have Telekom contract for Fiber connection ends on 1st of April and i’m planing to get O2 fiber instead, I have my own Unifi Router and ONT from Telekom, can i use the ONT from Telekom for the O2 fiber, and is there an guide what are the configurations like VLAN ID and PPPOE Setup, i work from home so the internet is essetial for me.

Thank you

Lösung von 5G_Tester

Yes, you can use the Telekom ONT if it is your own. If it is just for rental of your Telekom contract, you have to send it back to Telekom. 

7 Antworten

o2_Maria
  • Moderatorin
  • January 28, 2026

Hello ​@Nawart ,

Welcome to the community.
We're delighted that you're interested in a fiber optic connection with us. 
You can also use the router with a connection from us. However, you cannot use the ONT, as it is tied to a DTAG connection. You will need to get a new one.

You can find instructions for your router from the manufacturer. 

Best regards
Maria


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  • Autor
  • Einsteiger:in
  • January 29, 2026

@o2_Maria , So what type of ONT i can get, any ONT can work or only spesifc ones? from the website when i’m trying to initiate the contract, i don’t see any option for ONT , only Firtzbox routers with builtin Modems.

Thank you 


5G_Tester
Legende
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  • Legende
  • January 29, 2026

When you are on the page to choose the router, you have to select that you want to use your own:

Later in the process, you have to enter your Modem ID which is the ID of your Telekom modem. 

Inside “Schnittstellenbeschreibung” (https://www.telefonica.de/impressum/schnittstellenbeschreibungen-der-betreiber-oeffentlicher-tknetze.html) you can read all about the requirements of the ONTs to use. 


o2_Maria
  • Moderatorin
  • January 30, 2026

Hello ​@Nawart ,

It's great that 5G_Tester has already provided such excellent support here.
Did this post help you, or do you still have questions?

Best regards
Maria


Forum|alt.badge.img+2
  • Autor
  • Einsteiger:in
  • January 30, 2026

Thank you ​@5G_Tester and ​@o2_Maria ,

so i can really use the current Telekom ONT i’m using or i have to buy a new one ?

Thank you all


5G_Tester
Legende
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  • Legende
  • Lösung
  • January 30, 2026

Yes, you can use the Telekom ONT if it is your own. If it is just for rental of your Telekom contract, you have to send it back to Telekom. 


Forum|alt.badge.img+2
  • Autor
  • Einsteiger:in
  • January 30, 2026

Thank you ​@5G_Tester , it is my own device