I have seen so many threads about this topic and have already applied everything but couldn't find the Contract number. I bought a device last week and need to register on O2 portal. I need this contract number for signup on mein O2 portal.

Edit o2 Antje: Thread relocated to English Mobile 

edit o2 Tobias: moved to this thread

Hello @Achy12,

thank you very much for your question in our o2 Community!

If you have bought a new device, you will find your contract number in the corresponding invoice that is/was sent to you. Have you already received this and been able to view your contract number there in the meantime?

Have a nice evening

Jessica

Hi @Achy12, 

we did not yet receive a reply to the question of @o2_Jessica. 

Were you able to register your device at “Mein o2”?

You find also further information here: Managing your account online 

If you have any further questions, just come back here to our English Community. 

Loving greetings,

Tobias