This headset is fine when using an adapter for a different phone. The company was kind enough to send another when I told them it did not work on my Verizon phone.But the replacement would not work either,Plantronics MX150 Flexible Boom Headset with 2.5 mm Plugunless the adapter was use on another type of phone. Either way, I am without a working headset for my phone. I would recommend the company who was prompt to send out another at no cost.