The iPhone was killed a while ago. They make up less than 10% of new sales. The rest are Android with the rest hidden in the rounding error somewhere.
iPhones are generally a couple of years behind technically. The interface screen looks pretty much the same as it did when it was on the iPod Touch. It has been happily copying what it sees as good ideas from other peoiple but not a decent UI.
Nobody is copying Apple but if they want to copy others, this may help.