When I first started coaching, I bought a telephone headset so that I could speak with clients while still taking notes.
Five years ago I graduated from a wired phone headset to a wireless phone headset… freedom at last!
Now when I speak with clients on the phone I can get up and move around. Not just around my office either: my cordless headset will reach all the way out to the mailbox, 165 feet from my telephone base!
My preferred model is the Jabra (GN Netcom) GN9350. I can talk for hours on one charge of the battery and the sound is crystal-clear. This is especially important for teleclasses, as the quality of the teleclass recording is directly related to the quality of the microphone on your headset. Plus, there is no static or interference from other computer or electrical equipment.
Shop around for these cordless phone headsets, as prices vary. Try a shopping comparison site to compare prices and find well-rated vendors.
Also, be aware that some phone headsets are for Internet-based (PC) phones only, or have a specific plug type (like USB), so read the description carefully.