visitnigIphone caters to a entirely different niche in the market and the things they come out with are perfect for those population(high school girls, seniors)[/b], but upgrading to 4s or 5s is simply not worth it.
What? Apple caters to businesses and corporation as much if not more than any other phone producer. most android phones don't have the backing in terms of marketing and production that apple can bring to the table. Just an example that comes off the top of my head is.
Pepsico, a lot of their distribution(and a lot of their marketing and manufacturing departments) DSL's got Ipads with work since apple literally made an APP specifically for the distribution and computer system that pepsico employs, and well if 90% of your work is based upon An I pad it's logical you'd get a phone as closely compatiable with your ipad as possible. And since the company offers phone plans to their DSL's(and pays halfway since small format DSL's in metropolitan areas spend 20+ hours a week on phone calls with customers or corporate etc etc) They of course get cheaper deals on iphones through AT&T.
Apple approaches pretty much every fortune 500 company with similar plans/options, and sure samsung/android can attempt it, but it's hard to beat apple's offers since they manufacture out of china, for jack shit, and the Kaesong plant has been down for months now which has been hurting samsung as well(though it's set to reopen soon). Teenagers might be a nice market for them, but large corporations are the bread and butter, especially if you package in mac's and ipads. Hell UBS(where i worked/work) was literally handing out Mac Towers from like 2010 that at release were sold for like 2,000+ dollars because they decided to upgrade all their computers(i can't even begin to fathom how much they fucking spent on 250-300 new towers+ipads and integrating their investment data/software into a new computer system)
EDIT: if you want talk to horse about it, he's an intern over there now and i *think* he worked on the Iphone 5(not sure since he wouldn't release details but said his project would be announced early september..)