As expected, 5.5" doesn't exist because there is just no leaked parts for 5.5" so far.
"Apple reportedly filed the import application on August 5 and received certification of equipment and a written approval notice on August 8 for two iPhones with model numbers A1586 and A1524."
A1586 no doubt is the new iphone 6 as the model number is by far the largest, even larger than any model for Iphone 5S.
Right now, the highest Iphone 5C model is...guess what? A1532. Iphone 5C model is even higher than the unreleased A1524, so most likely this is a cheap 6C model.
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Interesting argument, but you must remember that the iPhone 5C didn't live up to the standard expected of it- by that, I mean the sales weren't that great. Tim Cook even admitted it.
I think Apple will either:
1: Discontinue the 'C' variants with the release of the 6S in 2015. Whilst reducing the price of the 'C' variants after the iPhone 6 launches.
2: Release a cheaper variant of the iPhone 6 in 2015, along side the iPhone 6S and market it differently to prevent the same from happening. (I couldn't see Apple releasing a iPhone 6C this year.
3: Replace the 5C with the 4.7" iPhone 6. I'll explain:
Past rumors have also speculated that the 4.7" iPhone 6 will have less powerful specifications than the larger 5.5" model. In which case, the 4.7" iPhone 6 will prove more affordable. This is a completely new marketing plan as Apple would be selling what seems to be premium phone that, in terms of design, is identical to the larger version. The difference is the specifications- which the public aren't as concerned by. This could prove vastly more successful then the marketing campaign lead by the iPhone 5C.
// Option 3 over
I have also noticed a lot of people claiming that the 5.5" iPhone doesn't exist as they have not seen any solid evidence. Whilst this idea is supported, I very much doubt it. Firstly, reports have suggested that the iPhone 6 may be delayed by a few months- which means part leaks will not be synced with those of the 4.7" iPhone.
Reports have stated that the larger iPhone 6 may ship in early 2015.
- Let's assume that means January.
- January is 4 months after September (the 4.7" iPhone 6's release date)
- In April, which was 4 months ago, we didn't see any solid proof of the 4.7" iPhone 6- much like we see little proof of the larger iPhone right now.
- In the coming months, like 4.7" and the months after April, more leaks will arrive.