Cross Upgrade with Next Up Lines
I have 4 lines with AT&T and am receiving bogo credits on two of them. I needed AT&T to transfer the bogo credits to the other two lines because the ones with the promotion also have next up on them so when I upgrade I will lose my credits. They told me they can't and I can do a cross-upgrade. I was told that if I call AT&T and upgrade the two lines that don't have the promotion and tell them not to touch the imei, I can just change the sims and it will work. Then I went to another AT&T store and they told me the opposite. Any help?