If you made (sic) the contract online or by telephone you have 14 days in which you can cancel the contract. Otherwise as it is a Flex Tarif you can terminate the contract at any time with just 4 weeks' notice.

Hello @RossiDev ,

welcome to the o2 Community .

You’ve already gotten some good Infos from bs0 for how you can end your contract. Aside from that you could also take a look at the LiveCheck and see if there are maybe currently any known issues that might be affecting the internet speed at your address.

Kind regards, Sven

@o2_Sven any chance I might get a link to so?
GooglePlay doesn’t allow me to download the app because of the country limitation and the website is anything but accessible

BR

@o2_Sven Update:

I did manage to get the app working via VPN 

I get server error 503 when trying to log in using the same credentials that get me in from the browser.

Can I get a confirmation from your side about what to do? I don’t want to waste money because of a technical issue external to me.

You don't need the app.

To cancel the contract within 14 days send an email to widerruf@cc.o2online.de. 

To terminate the contract: http://info.o2online.de/kuendigung/

Dear @RossiDev ,

as @bs0 already mentioned, you don’t need the app to make a withdrawal.

Please use our form for a withdrawal and sent it by Email within 14 days after the activation of the contract to us ( widerruf@cc.o2online.de).

Then it will be cancelled.

Kind regards,

Andrea