I currently have a galaxy A21 and my old phone is a Galaxy J3 and still in working order so I'm wondering if it is possible to use that under the same current number by just applying for another sim card.
You can't have 2 SIMs with the same no. You may swap the SIM from 1 phone to another.
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Any individual mobile number can only be used with one SIM at any given time.
You can't have duplicate SIMs operating against single mobile numbers - your only solution here will be to either have 2 separate lines, or swap the SIM between each phone as it suits you.
