The audio adapter is designed for the Blackberry Curve 9315:

• Blackberry Curve 9315

If you prefer to use a 2.5mm headset with your Blackberry Curve 9315 cell phone, you will need to plug in the 2.5mm audio adapter in order for the headset to work. Just plug this audio adapter into your cell phone to convert the audio. This adapter allows you to use a 2.5 headset with your Blackberry Curve 9315 phone.

• Easily installs; simply plug the audio adapter into your Blackberry Curve 9315 cell phone audio jack; then plug in any 2.5mm, two ring headset into the audio adapter