What's your hardware setup for “coding interview” phone calls?

My setup is “no thanks.” Coding while on the phone is absurd.

I'll usually have my bluetooth headset connected to my mobile phone, assuming the phone's reception is strong enough. That makes it easier to do a phone interview on an OK-not-great connection. When screen sharing over a connection w/ a modest upload speed, it's can be OK if the interviewer doesn't get super fast updates on the video. But if you're chatting over the web & the audio quality gets impacted by a slow upload speed, the interview grinds to a halt super fast.

I've done quite a few phone screens with coding over the past few years, and the best solution I've found is a headset.

Speakerphone means that the interviewer hears every key-stroke and likely can't hear you. A decent set of earbuds with a microphone can be had very cheaply, and to me are an absolute necessity for a phone interview.

I now use them even when not coding, so my hands are free to take notes on the call.