415-539-3535

This is an interesting one. This number may not be in use anymore but it once belonged to Phil Zimmermann who created PGP Encryption software. It's listed on his website but it's not a simple number for anyone to quickly read.

If the number is still in use by Phil then it looks like someone is spoofing his number which pretty much anyone can do nowerdays. It's possible for anyone to call someone and have the number show as 911 or any other number you so desire.

Most likely the number is no longer in use since he sold PGP to Symantec and his website is stuck in the mid 90's apart from a few updates.

Only way to avoid these calls is to cancel your phone and stop using it which isn't much of an option really. This all thanks to large companies who want the ability to hide the fact their calls may be coming from staff members homes rather than the office and anyone can join the service and use it.