Who called from 4089700000

I traced this number to

P. Srisuresh
Kuokoa networks
2901 Tasman Drive, Suite 202
Santa Clara, CA 95054
Phone: +1 408 970 0000

and

475 Potrero Ave
Sunnyvale, CA , 94085-4118  
Phone: 408-970-0000

I received a text saying "steve has sent you a sprint sms voice message. call 408-970-0000 to listen." I have no idea what this is.  has anyone figured it out?

Received text with the following.

"Thomas has sent you a Sprint SMS Voice Message.  Call 408-970-0000 to listen."

Received text with saying "Elizabeth has sent you a Sprint SMS voice message."

Somebody please shoot this stink monkey!

I received a text message that said:  "M has sent you a Spring SMS Voice Message.  Call 408-970-0000 to listen."