they leave no message,when I pick phone said hello first time. then call it back they line was disconnect.

said he was from ADT and understood my system was more than 3 yrs and wanted to upgrade my service ..I don't have ADT .. I hung up ..

A man with an Indian accent called and asked if my AT&T security system was over 3 yrs old.  Now I used to say I don't have a security system but then someone pointed out it could be a thief checking to see if I have one so I told him my system was only about 6 mos old.  He said okay and hung.

The called me, very thick Spanish accent saying, "Is this my name, You've been an ADT customer fro over 3 years? I said no! and was about to say put me on your no call list and they hung up. Called number back, disconnected! Call the police and they said another lady had the same call.

Recording started, Do you own a timeshare? I hung up at that point. Looks scammers are reusing numbers.