Yeah - not sure why you would want to move a number between 48 accounts. Unless you had a number of pre-purchased memberships on one account which you wanted to use with the number on another 48 account? I don't know if this FAQ about SIM juggling might be of any relevance here? Ultiamtely you probably need to log a support request to ask 48 about this directly:
You need a new SIM?
