If you mean 3 bands that exist on a standard stereo headphone set, vs the 4 bands that are on the supplied set that has a microphone also.... then yes. You can use any standard stereo headphones with a 3.5mm jack. I have myself while trying to get better quality sound.

 

Will the headphone jack's 4th pin also work for a data dongle, like Swype's credit card reader that works on the Evo and Photon?

 

TheBundo
Honestly son't know about that piece of equipment, anyone else have any insight?

 

The Square dongle works great on the OG Evo 4G, since the 4th pin in the headphone jack is a data pin. What I don't know is if that is a universal industry stardard, or maybe something that just some companies, like HTC, incorporate into their design.