Hello,
I bought a new O2 prepaid SIM and it is not possible to activate it. The problem is when I want to enter the date of birth, it always shows that I have to correct the date, so I cannot go with my registration. I also tried the online help, but without success. I am now in quarantine and I cannot visit O2 store. Can you please help me to get my SIMu aktivieren?
Edit o2_Vivian: verschoben Prepaid → o2 english community: mobile
Edit by o2_Andrea: title translated to english
Lösung von o2_Andrea
Dear
welcome to our community. 
Unfortunately, your forum account is not linked to a phone number, so I can't check for you.
Please have a look at our article on prepaid SIM card registration first.
Does this already help you?
Your date of bith is written in dd.mm.yyyy?
Kind regards,
Andrea
+9Bitte entferne deine Telefonnummer. Du bist hier in einem öffentlichen Forum!
Dear
welcome to our community.
Unfortunately, your forum account is not linked to a phone number, so I can't check for you.
Please have a look at our article on prepaid SIM card registration first.
Does this already help you?
Your date of bith is written in dd.mm.yyyy?
Kind regards,
Andrea
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