It can't be done easily as you haven't said if he is a sim only customer or he is also paying for a phone. For sim only he could take out a new sim with Sky and then get a Pac code for the number he already has to transfer it to a PAYG network then get another Pac code to transfer the number back to his new sim on his account. If he is paying for a phone then noting can be done as it can not be moved to his own account.
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