well prioritizes means that a company modified how its phone reads input from the headphone jack.
Standard Jack input from the base of the jack is left input, then right input then ground.
Standard Jack with a microphone input from the base is left input then right input then microphone input, then ground.
A Prioritized headphone jack has all of those but in a different order so it will not allow for standard headphone with a microphone to run with the phone.
Its simply to make the owner of the phone (me) have to use that companies headphones (Sony Ericsson).
Sorry if you didn't understand that, but that's the simplest way i can put it.
EDIT:
I have fixed the problem. it was not my phone that was prioritized, it is apple that prioritizes its headphones.