if its less than 6 months old, cingular should warranty it, if its under a year, but over 6 months motorola will replace it if you call them and tell them about it, then send them your phone, and they have a tech check it out and send a new one if they determine it in fact is broken. i always keep my old phone becuase of this and ive lent it out a few times for my friends in the same situation.
Samsung FTW