Might need a bit more info on the car (is it a W211 or 212) and is it in Comand?
Ok, good point sjmaxwell.
It's 2014 w207 with Comand. I've had a look at the install page but can't see anything that points out if, or how to remove the old phone ID.
Could it be that it just lives in the memory of Comand?
Pete
It's 2014 w207 with Comand. I've had a look at the install page but can't see anything that points out if, or how to remove the old phone ID.
Could it be that it just lives in the memory of Comand?
Pete
Merc Owner 2B
MB Enthusiast
It can be deleted. Systems vary. Do you have the manual?
Merc Owner 2B
MB Enthusiast
De-authorising (de-registering) a mobile phone
Mercedes-Benz recommends de-authorisation in COMAND Online and on the mobile phone. Subsequent authorisation may otherwise fail.
Press the function button on COMAND Online.
Select Connect device from the telephone basic menu by sliding and turning the COMAND controller and press to confirm.
The Bluetooth® telephones list appears more.
Select the desired mobile phone in the Bluetooth® phone list.
Select the list symbol to the right of the entry by sliding the COMAND controller and press to confirm.
Select De-authorise and press to confirm.
A prompt appears, asking whether you really wish to de-authorise this device.
Select Yes or No .
If you select Yes , the device will be deleted from the Bluetooth® telephones list.
If you select No , the process will be cancelled.
Mercedes-Benz recommends de-authorisation in COMAND Online and on the mobile phone. Subsequent authorisation may otherwise fail.
Press the function button on COMAND Online.
Select Connect device from the telephone basic menu by sliding and turning the COMAND controller and press to confirm.
The Bluetooth® telephones list appears more.
Select the desired mobile phone in the Bluetooth® phone list.
Select the list symbol to the right of the entry by sliding the COMAND controller and press to confirm.
Select De-authorise and press to confirm.
A prompt appears, asking whether you really wish to de-authorise this device.
Select Yes or No .
If you select Yes , the device will be deleted from the Bluetooth® telephones list.
If you select No , the process will be cancelled.
As above, got there before me! 
