First it pairs all the time with my phone and very fast unlike some Garmin Nuvi's I've had for alot more money.
When the phone rings you grab the mic and touch the blue button on it and it will recieve the call. Touch it once again and it hang's up. CB is cut out while talking automatically but comes back when you hang up. You talk into the mic and listen to your caller via cb speaker. You can redial the last number dialed by hitting the button twice I believe. Also hitting the button you can give voice commands to your phone if it takes it. i.e. dial "Home". or dial "Harry".