iPhone always had a headphone jack, not that it was easy to use at first. The jack was recessed in the aluminum back with just enough space to fit Apple’s standard earbuds. Many of us bought (and lost) dinky little extension cables just so we could use our favorite headphones. It sucked.
The curiously recessed jack went away with iPhone 3G to thunderous applause. Nobody clapped at the hardware beauty shots until Steve Jobs said “flush headphone jack”:
Sometimes you have to flush twice.