Does anyone know how can I request specific phone number from telco company?

I previously used that number, but then it was terminated. After years, I need that phone number for my email account verification. I checked, the phone number is currently not owned by anyone.

I'm not sure where should I go to get assist on this...

go to telco official facebook and ask

number already printed as prepaid sim pack but not sold or register nothing you can do

can, some telcos offer this. if you know someone even easier, can select number and port over that number

go to their service centre

register a postpaid line