I currently have 4 lines on my account. 3 of them are grandfathered unlimited. 3 of them are eligible for upgrades. The 4th line is not under any obligation. I spoke with a Costco rep today regarding the S5 and the buy one get one free thing. He told me he knows how to work the system whereas I would get 2 phones and still be able to retain my unlimited data plan on all 3 lines while signing up the spare line for a New Every Two. Is he really going to be able to do this or is he yankin my chain?