I am looking to upgrade to the Note 5 and I wanted to know if I will be able to use the upgrade of one of my family members that is on my plan.
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YUP, alternate upgrades are still viable IF you are authorised on the account to make these changes.
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Also if they have a basic phone on that line you will have to keep a data plan on that line for as long as that contract is active even if you put a basic phone back in it's place.