This number called left no voicemail or return call information. I google it and found another person stating they just call 5-6 times.  I do not return a call either, it is a trap. I am speaking from my boyfriend who did this, next thing you know he gets a bill and they used his number to call out of state..something crazy but anyway- DO NOT RETURN A CALL if they leave you no voicemail.  people you know would know this about you to either leave a message or send a text.