Basically, Apple is trolling the carriers by giving people with the 4 or 4S a very good reason to upgrade to the 5S or 5C. By trading in their current phone, they might be able to get a new 5S or 5C for very cheap, "free", or even get money back. Sure, they would have to extend their contract, but it's not like people switch carriers.
Dat sweet sweet subsidy cash :hmm:
Dat sweet sweet subsidy cash :hmm: