Ford Fiesta 2010 Owner's Manual page 159

Telephone
Debonding a bonded phone
A bonded phone can be deleted from the
system at any time, unless a phone call is
in progress.
1. Press the PHONE button.
2. Press the up/down buttons until
SELECT PHONE is shown.
3. Press the OK button.
4. Press function button 1.
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(G1084336)