@Jjake
do you mean your old cell network number ? During the activation process, you 're given opportunity to either take a new number or port your number in to your new Public Mobile account. Just make sure to not cancel the other plan until port to Public Mobile is successful. Is your old account with different provider still active or did you cancel already ?
added...here's some reading..clipped from the Help Files...
https://www.publicmobile.ca/en/get-help/articles/transfer-your-number
