Mine seems to play random ringtones for unknown callers. It has yet to play a wrong ringtone for a particular contact. The other night I was on the couch talking to my fiance (sitting next to me) and her ringtone started emitting from my phone. No one else has this associated with their number so it gave us cause for concern. It was an 877 number that Comcast uses to sell their phone service. Wierd indeed.