Samsung Galaxy S3 — Resetting Galaxy S3 SIM Card

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Sep 28, 2014 7:13:59 PM via Website

I have a Galaxy S3 and it says it already has a number for that SIM card.

I switched my service from my old phone onto this Galaxy but I want my old number. Our carrier has said it has already gone through and gave us a 3 digit number to 'call' to activate it, but by doing that it says it already has a number on it, but it's not the old number.

How do I reset this SIM Card, or what are other ways of fixing this?