Assuming it's like basically any other phone, you can use headphones with an 'inline' microphone and it should work. Bluetooth may be a better option?
Still have not made one phone call on it ,unsure if i can use earphones as the speaker is too low in volume for me.
Use NORMAL headphones without a microphone.
The audio comes out the headphones, and the microphone is still the handset you can just hold like...a sandwich (because i'm hungry....)
I found 2 hidden volume controls that raise the volume on both mobile and apps. Asked a guy in Whingepool he mentioned not many people know this and leave it as default. So i can hear phone calls now and talk properly.
If you tap the volume indicator down drops 2 sliders ,when i first saw them both where on minimum so i cranked them up. Love playing with ring tones ,got them set on Nightingales. I can hear them fine as they high pitched and annoy the hell out of me.