No the unlimited is tied to the line is is currently on. You can add the phone and swap phones. Then you'd have one on unlimited, the 6, and one on a regular data plan.
The unlimited plan is tied to the SIM card. Not the phone. Buy the phone outright, replace the SIM card that has the unlimited data acct and you are good to go. I have done this many times.
So since I want to have 2 iPhone 6 plus phones on the account I can buy 2 phones outright add one line and switch the sim from the iPhone 4 and that is it? I would then have 1 phone on unlimited and one on what ever the gig plan I get and they would share voice minutes. So if I what is my expected bill for this? I currently pay $29 for the unlimited data plus $59 for 950 minutes (which is enough for both of us) so I would add $10 for the shared line and another how much for 2gb of data?
Huh?? Youre confusing yourself and us. iPhones dont have SIM cards.
So since I want to have 2 iPhone 6 plus phones on the account I can buy 2 phones outright add one line and switch the sim from the iPhone 4 and that is it? I would then have 1 phone on unlimited and one on what ever the gig plan I get and they would share voice minutes. So if I what is my expected bill for this? I currently pay $29 for the unlimited data plus $59 for 950 minutes (which is enough for both of us) so I would add $10 for the shared line and another how much for 2gb of data?