With the top drawback for people buying an iPhone being the "cost" for either the device or service, WHY DO YOU PEOPLE KEEP THINKING APPLE WILL MAKE A MORE EXPENSIVE IPHONE?
Apple is not going to make a higher-end iPhone. About 10,000 people would buy it, meaning the price would need to be about $1,500 to pay for all the R&D and production costs of such a low-margin device. The iPhone covers most of what people want that is realistic. Why a solar charger would be worth the extreme expense baffles me. Such a feature is just now making it on cars, which, um, bathe in sunlight. The only such charger I could see being useful on an iPhone is a pocket lint charger.