Why sync your address book?
Without syncing, the app shows your contacts' names on the phone, but the web space only sees numbers. Once the address book is uploaded, the online dashboard and history show who called. This matters most when you plan customer call backs from a computer, or when someone else does it for you. Syncing also feeds your message templates: the first name inserted by {first_name} comes from the address book, which makes the automatic SMS reply feel more natural for regular customers.