If you can get the free upgrade then do it as that is going to be something that is going away with most of the phone companies this yr. Yes if you get tec, it's a purchase but if you check and this might be the last time you can do it for free if you don't do it then you will end up doing at a leter time and then have to pay....Who wants to pay if you can do it for free. You recycle the old phone.
I say if you can do it for free then you should! Part of compacting is not buying new, to recycle,