I requested number portability to O2 from the other carrier (in fact - I did it 3 times - once I filled the form when I was ordering a SIM card, then I sent a PDF form to o2-rufnummernmitnahme@telefonica.com and finally I filled another form in Mein O2 → Tarif & SIM-karte).
How soon the transfer will happen? Can I know status of it? I haven’t received any acknowledgement if my request was at least received. It is frustrating - I send forms and then nothing happens.