yes you can open a new line, put it on a family plan move that new iPhone 6 to your current number and then put a dummy phone on the new line with no texts or data and just sharing minutes with your phone. i did that years ago when the iPhone 4 came to big red and i had no upgrades, i had to open 2 lines for a phone for me and my wife, we had horrible blackberry storms and now i have an upgrade every year bc of that cycle bc i have 4 lines. now its a family plan so every things shared and i use 2 old flip phones to put on the 2 lines i don't use. it didn't cost me any more a month in contract either maybe 5 bucks or so