It is very unclear what should be done.
I just started a contract with O2 and as I finished the portability request, a warning told me that I should tell Vodaphone.
But how do I do this?
Where do I do this?
Shouldn't this have been said to me BEFORE I finished the procedure?
Would appreciate help.
(Moved to our english community, o2 Michi)
Hi
welcome to our community. 
Which message did you get from us? Was it maybe a missing opt-in to release your phone number into your new o2 tariff?
If that’s what the warning contained, you just need to tell Vodafone to set the “opt-in” in your contract.
Best regards,
Michi
Thanks for the quick answer, how do I tell anything to Vodaphone?
Hello
You simply have to contact Vodafone's customer service!
Kind regards
Jessica 
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