Audio Guest Book Wedding or Any Occassions PhoneFAQs Q: How do I use the Audio Guest Book? A: You want to make your Guest Book fully charged with the cable provided in the box. Make sure your SD Card is inserted. The Host would leave a message by hitting the record button and then leaving a message to their guest by picking up the phone. Once you have said your message you can now hang up. All your guests have to do from there is pick up the phone, hear your welcome message, then after the beep