same thing just happend to me. got out of the shower and saw I had a missed call from this number. called it back and it has been disconected.

Received a call from this number at 11:52 AM.  No message left.  Called the number back at 11:59 and received "number has been disconnected or is no longer in service" message

RCVD a call from (770) 410-7350 displayed as "Alpharetta, GA". Caller immediately hung up when I answered. Called back but number came up with "The Number You Have Reached has Been Disconnected or is No Longer in Service".  This is probably a marketing company testing their phone number database for active numbers so they can sell their list to telemarketers.