Just for reference, it's not a carrier setting. It's provisioning of the actual sim card. Doing a sim switch online via your personal portal can "enable" again not activate, sims that were previously had the same number on it. This is easily done ...
I believe you could "reactivate" it with the same number. Not that its really handy, but say you have 2 devices and 2 Public Sim inserted in the phones. You can switch your number from one phone to another by "enabling" (trying to not use the word ...
