have received calls from this number too. caller ID: test code CO. Like you no message. Reversed call. Phone company indicated it was an "invalid number". Have received these calls at least 4 times in one day for past 3 days. Three in succession about 2 minutes apart.

This number has called over & over again today. I haven't answered the phone because the caller ID says Test Code CO (suspicious) & they leave no message. Calling the number back says "The number you have dialed is not valid". After reading all of your comments I am now blocking them. Thank you.

Political poll - probably Republican.

I got a call this morning from this same number, I did not answer but the ID said: Test Code Co.

I got a call from this number this morning at 10:19.  I have received calls from this number before.  My caller ID for this call read Test Code, CO.  When I answered the call, it was just dead air and then the call disconnected.