Yup, same thing. The incomplete phone number 310487598 called and left no message. Probably, this is the result of a clever software program designed to hide the identity of the caller. (Today's questionable software can make phone number read as any number you want it to...) The intent, obviously, is to make it appear that someone is calling you from the Los Angeles, California area. (310) is L.A. The most likely explanations - these are either A.) phishing expeditions to get into the software of your phone, B.) Sales calls looking to get around the Federal "Do Not Call" lists - you can't report them if you don't have their real number, or C.) Bill Collectors making certain you don't know who is on the other end of the line.