760-705-8888 is a Google Chat Phone calling you
With the rollout of a live domestic-call phone capability in Google Chat, everyone should expect a lot of calls from 760-705-8888 to start appearing in to their caller IDs.
760-705-8888 is the generic Google Chat Phone number all Google chat users are assigned as caller ID, and it is the same number no matter what Google account a person is calling you from.
Just remember that a call from a 760-705-8888 number may not be from the same person as the last person who called you from 760-705-8888!
Also of note, Google kept the Grand Central numbers “live” for all us original beta (alpha?) testers. So everyone who has/had a Grand Central account that was absorbed into Google Voice and is now Google Chat still has the same phone number as before, and not the generic 760-705-8888 number.