I have an iphone 4S, with unlimited data, hubby has the 4 with a 2GB data plan. I transferred my upgrade to his line and ordered a 5. I plan to switch so his 4 to my line, activate the 5 on his line, and then switch so he keeps the 4 and I get the 5. Will this work? Anything I need to know about trying this??? I'm assuming when switch the 5 to my line after activation is when I might have trouble?