PLEASE HOLD is a totally goshdarn working handset that's compatible with almost any cell phone in the US market. Most phones work directly with the 2.5mm phone plug that's on the end of the coiled cord. We've included plug adapters for most Nokia and Sony Ericsson phones in the package. But this begs the real question...WHY? Well, sometimes...goofy is just good. This retro handset doesn't really make sense but it sure is fun. Whether you're making a political statement, trying to minimize your exposure to radio wave transmission, or just having a goof, you'll look just swell with PLEASE HOLD!