Google Voice SMS bug: outbound texts sent from random numbers
2 comments
This is the intended behavior. They piggy back off of a large group of local numbers. For texts they assign one to you for a short period then put it back in the pool.
A few months ago I had a Google Voice number that they also assigned to another person, while I was actively using it. Happened to a friend too.
Ongoing support thread: https://productforums.google.com/d/topic/voice/OUmPhUpujjs/discussion