I disagree. They are already producing all the parts for a 5C with LTE. It's just a case of putting the existing units into a a plastic housing. It would be much more difficult and costly to set up and entirely new manufacturing line just for the innards of the 5C.
So you want me to believe that they're going to introduce a 3G-only phone in 2013?
It is EXTREMELY unlikely and would make them look quite foolish.
Other manufacturers don't have problems manufacturing different phone colors with 4G chips that work on multiple networks in different parts of the world. Why would Apple?
Since they are currently selling 2 NON-LTE models: 4 & 4S, I say yes!
But, it isn't called 3G anymore, they call it 4G since it has increased speed abilities, at least with AT&T
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The thing is, the 5S, and iOS 7 is going to be the big reveal at this special event. The 5C is simply a replacement for the entry level iPhone that will run all of iOS 7 features, which, the 4S does not.
Apple will not just drop the current iPhone 5 model, there is no way, absolutely not, they've never done this, always get 2 years out of a form factor.
Plus, they will drop TWO phones 4 & 4S at once, which each have different innards. So, by taking the iPhone 5 innards and only taking out the LTE chip (which has 3 variants:
http://www.apple.com/iphone/LTE/) and putting in a single global universal GSM/CDMA (similar to 4S), they will still save costs.
They'll still have 2 LTE models, which is more than last year. And LTE will be the upgrade incentive to get an iPhone 5 or 5S.