Except during the first generation iPhone there was that little thing called a CONTRACT to AT&T. The evidence is pretty clear that is coming to an end. So, time to start making phones for other carriers!!!
Thats not what i meant, what i mean is that if Apple's plan was to make a CDMA iPhone that could be software upgraded to turn on an LTE chip, they could have just done the same and made the 1st gen Edge only iPhone with a 3G chip that was able to turn on with a software upgrade.....something Apple won't do.