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I'm not sure I can explain this so that you can understand.
You are on an old plan that allowed you to add a line for $10 a month and share min/texts/data. Those plans are long extinct now, and to upgrade will require a change of plans. You always pay full price for the phones...it's just a matter of all up front, in installments, for by paying extra each on the access charge for that one upgraded line.
Best of luck.
