Ok, so I've been burned in the past by giving up my unlimited plan on my line, but since then we've added 3 more iPhones to our family plan, got an unlimited texting plan and upgraded a few times. I'm trying to make sense of the new Mobile Share Value plan and see if it's not too good to be true and understand how it will impact us in the future. We're all locked in at 2GB DataPro right now which is $25 and we get a 25% discount so each smartphone line is $26.25 ($9.99+$25-$8.75) plus tax and dumbphone is $7.49 ($9.99-$2.50). Our bill today ends up being $176.15 for all 5 lines on the 450 minute plan which we never use all of. So the first question is discount/tax related: Will our bill really be $150 if we switch to the 10GB share plan? If so, maybe we'd just go with the 30GB plan during the current "doubling" promotion for $172.5 (after our discount). (disregard 30GB plan idea) The second question is related to actually upgrading these devices. I've seen some comparisons and calculations for single plans but these don't seem to take into account that you can sell your device. I've always been able to sell my iPhones since the 1st gen and get roughly enough to get the next iPhone that's available every 2 years. At the same time, other family members are happy with their older iPhones and will just upgrade if they lose or break theirs. Do these new plans have the most benefit if you upgrade every 12 or 18 months and do you get to keep/sell your old device or do you turn it in? Thanks in advance to anyone willing to weigh in, we're just worried that the new plans are too good to be true and switching is going to come back to haunt us like other things AT&T has done in the past.