BMW 2008 M5 Owner's Manual page 220

You can select the displayed service phone
number if your mobile phone is logged on in the
vehicle:
iDrive, for operating principle refer to page 16.
1. Press the button.
This opens the start menu.
2. Move the controller forward to select
"Communication".
3. Select "BMW Contact" and press the con-
troller.
4. Select "BMW Contact Numbers" and press
the controller.
5. Select one of the following menu items and
press the controller:
> "Roadside Assistance"
> "Customer Relations"
> "Service Request"
6. Select "Call" and press the controller.
Contact is established.
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Transferring phone number via tone
dialing method
The tone dialing method is required for access
to network services or for controlling devices,
e.g. remote checking of an answering machine.
This function is available when a connection
has been established.
1. Establish connection.
2. With a single drive:
Press the controller.
Select "Keypad" and press the controller.
With two drives:
Move the controller backwards until the
bottom field is selected.
3. Select the desired character and press the
controller.
Each character is sent immediately and
confirmed by a tone depending on the
mobile phone model.