Like most Bluetooth headphones, the Jaybird Run XT have a mediocre integrated microphone that's best suited for calls in quiet environments. If you take a call in an empty meeting room or quiet hallway with these headphones, your voice will sound thin, muffled, and lacking in detail but will still be intelligible.

Can you talk on the phone with jaybird?

Yes. You can accept/end or decline phone calls using your Jaybird Vista multi-function button on either earbud. To accept an incoming call, single press on either earbud.

Does jaybird X4 have a microphone?

The integrated microphone of the Jaybird X4 is mediocre, but it is usual on most Bluetooth integrated microphones, especially on wireless in-ear headphones. The speech recorded with the X4 mic sounds thin, muffled and lacking in detail. This should not be your first option for calls, and definitely not for gaming.