Bought iPhone 5 on one line and want to use it on another--process?

[news]

[cellulartalk]

i have a family plan, and only one of the lines is eligible for an upgrade. it is my son's line and i want to use the new iphone on my line. my current phone, a 4S will become his phone (he currently has a 4). must i activate the new 5 on my son's line, which will deactivate the sim in his...

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