Did you see my post? apple is taking pre-order for iPhone 6 allowing people on old Family Share plans that have unlimited data, to add a brand new line, and get a discounted iPhone 6 with unlimited iphone data plan. This probably wont last long but its worth a try, I just checked it as of 2 minutes ago its still working. Then if this works, and they actually let you keep unlimited data, turn off the line that you were going to do the upgrade with, and you will be left with 2 lines unlimited data, and a discounted iPhone 6.