Who called from 3609278905

This person calls day and  night, sometimes really late an hangs up. is my husband leding a doulbe life?

Its a cellular phone based in the Bellingham, WA (or Whatcom County, WA) area.
The only other option is that it could be a foriegn telemarketer using one of those programs that spoof the caller ID's.

This person called me to and asked for someone I couldn't understand.  He sounded Asian.  I live in the same county, it was a local call.