What do you mean "when I was picking my number"?
I'm not aware of any step in activating a SIM that involves picking any number.
What number are you referring to?
You won't be able to activate a SIM twice.
I suspect that you will have to get onto support another way to get this sorted out.
See the link in my signature below.
Hope this helps.
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I am not a 48 employee - if you need to contact 48 support you can do so by
chat or
email ([email protected]).