Transferring upgrade within account??

adlx21

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Sep 19, 2011
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Question. I have 2 phones, one with unlimited and one without. The one with the unlimited plan has an upgrade. How can I transfer the upgrade to the basic line(without unlimited) online? I do not see the transfer upgrade option on the page where you upgrade devices. I am the account owner too.
What I want to do is keep the unlimited plan and upgrade to the S4. possible?