I'm hoping that this will be an issue that's known to some of you here. When I use [with my phone] earphones with a built-in microphone, the music through the earphones is distorted, sounding kind of like I'm listening underwater. When I use earphones without a built-in microphone, the music sounds just fine. The earphones are fine - I've got two pairs (Altec Lansing Musx MZX206W) and they work fine when plugged into my PC and they worked fine with my previous phone. When I use earphones without a built-in microphone the sound is fine. My current phone is a ZTE Blade V but it's not a very popular phone so I've not managed to solve the issue after asking on the Blade V subforum.
Note: I haven't tested whether the microphone works; that's not the issue I want to focus on atm.