Any luck figuring it out? I'm trying to find out who it is too.. They tried calling a little bit ago. Never leave a voicemail and with the time zone difference they're calling me around 5am...odd
(408) 290-6657 this number is from an app called "Sideline" call which is a 2nd phone line app. Anyone can get a private number of their own and call you from this app and this number (408) 290-6657 will show up on your caller id.