Rivet offers an iPhone-compatible headset that allows you to listen to high-fidelity audio, and answer your phone calls with the same earphones.
The Stereo Headset uses a unique lanyard design to keep the buds from falling too far. It includes a remote switch to begin and end calls, and your music is automatically muted during calls. Noise-isolating design ensures clear audio.
Get it from Amazon for just $29.40.