lol it's so bad your can’t even send images 

I sent an image to show what I’m talking about but it doesn’t show up, great job 

“Ihre Adressdaten sind automatisch korrigiert worden”
 

Who had the idea to implement this is a genious. Best part is I already updated my address on my account and it STILL updates to the old one, so the genious probably implemented some local cache variable somewhere in your system to update the address automatically, and forgot to update this cache when you update the address. What a bright mind. 

By the way, for anyone thinking of getting a line connection with O2, here they ask if you already have a “Router”: 

“Für die Nutzung von Internet über Kabel sind spezielle Kabel-Router erforderlich.
Das trifft auf dein jetziges Gerät nicht zu?
Dann wähle einfach die AVM FRITZ!Box 6660 für 4,99 € mtl.”

Yeah sorry, this is not a Router, this a Modem+Router. You don’t need a router to get internet, but you do need a modem. So to say “You need a special Router that accepts Kable/DSL” is deceiving to say the least. You don’t, routers work on the Ethernet network, no Kable needed. I assume someone who doesn’t click this option is gonna have to buy a modem themselves, NOT A ROUTER, A ROUTER WON’T WORK, YOU NEED A MODEM. 

So besides hiring better web development people, might also want to invest a little in someone who understands about computer network fundamentals. 

You can find the Telefónica interface description here:

https://www.telefonica.de/impressum/schnittstellenbeschreibungen-der-betreiber-oeffentlicher-telekommunikationsnetze-nach-41c-tkg.html
It is advisable to read this before deciding to use your own device and to familiarise yourself with what you are actually ordering.  See product information sheet, terms and conditions/service description and price list. 

If it is not about ordering a new connection (new customer), but about moving an existing o2 DSL connection to another address:

Hi @idcidcidcidc,

welcome to our community

Yes, you are right that all that is needed is a modem so that one can use an Internet connection. However, this is colloquially called a router, which is why we pick up on this and also use the term "router".

Did blablup's tip help you and were you able to arrange your move with us online?

Kind regards,

Larissa