i've seen some that will, some that won't
a 3.5mm or a 1/8" jack is the standard headphone jack and most everything.. laptops, desktops, ipods, etc..
the only issue as previously stated is that is it slightly recessed in the metal case of the phone for (i think) appearance.
some third party headphones will work totally fine out of the box, some will need the small adapter, which just extends the jack enough to be used.