this would be a pre-install voicemail number from AT&T in N. California.
There are only two things that could have happened.
1. you called your self and accidently left a message for your self.
2.Someone called you , using AT&T voicemailbox and didn't leave a message.

Any way you put it, It was just a user calling through the AT&T voicemailbox .

Does AT&T offer this number to customers to use it to install an extra voice mail box so customers can have another mail box to use besides the mail box they already have from their existing cell phones?  In short, someone wants to have two mail boxes from AT&T cell-phone system?

whoever called me from this number this morning.....threatened to pop a cap in my [***]....terroristic threat....three years in jail. so sorry for you...whoever you are. Dont know you and know what I did to deserve such violence but I guess Meth does weird things to ones brain. good luck with that and hope you find peace one day....we all try to get through life imbedded with obstacles and whoever said that life was fair....I have lots of them and having someone wanting me dead is the last thing I or anyone needs to deal with. If whoever you are does end up killing me then Its my time to go but heed warning of Karma....it always bites you in the [***] in the end...guaranteed that I will haunt forever.
Black Mamba

No message...

stop calling me!!!!!!!!!!!!!!!!!!!!!!!!!!!!