The telephone unit, available as an optional extra, was developed specially for the Audi A8, Audi A6 and Audi Q7. It offers a dual-band/GSM car phone for use of D and E networks in combination with a user-friendly hands-free unit. High-performance digital technology eliminates disturbing road noise. The new SIM Access Profile (SAP) is in addition used, enabling the mobile – including with the handset – to be operated via Bluetooth without using the GSM module fitted in the mobile itself (no mobile phone adapter required).