This Mercedes SIM/ BLUETOOTH ADAPTER SAP V2 CRADLE MB Benz A2048200535 is a top-quality hands-free system that enables you to stay connected while driving. The device is designed to provide seamless Bluetooth connectivity with your compatible device, allowing you to make and receive calls safely while on the road.

I removed this from the car this evening and it was working fine with my Fairphone android. I have read it it is not compatible with some phones.

I set it up using a YouTube link

https://youtu.be/rMS6VFgia8I?feature=shared

It comes with instructions and box. Note the SIM cover is missing but this does not impact how it works. It can also be used withe a dedicated SIM card for the car.