How do I switch my number over from its older one to a newer one if the older one doesn't exist anymore ??

[tedmachin]

so I don't really have a phone , so I had to use a disposable phone number when creating my seller account. and since I'm fairly sure only one Disposable phone app exists that allows texts msgs from websites for confirmation and I'm fairly sure it just reset my accounts phone number so how do I create a new phone number since the old phone number basically dosen't exist anymore ??