Have you tried the app? What exactly doesn't work with the customer portal?

If online doesn't work then you should phone the hotline.

Hello @azzyrus,

welcome to our o2 community 

That is unfortunate that you have lost your mobile phone.

Could you call our english hotline via 089 66 66 30 08 1 to have your SIM card blocked?

What happens when you are trying to open your customer portal? Do you get an error message?

Best Regards,

Gerrit

Hey Gerrit,

This is the msg and it’s been there for the last days.

Does the hotline need to be dialed in from an O2 carrier?

Thanks and regards,

A

Hello @azzyrus,

if you have a contact e-mail address deposited in your customer account for us, you can receive a one-time password via e-mail even when you are calling from a different number. If our regular hotline is not active, you can have your SIM card blocked via our emergeny hotline 089-6666 300 44.

Have you tried a different browser and/or erased history and cache and tried again?

Best Regards,

Gerrit