Multiple calls with no message

Called my mobile at 5:59 PM on Saturday. Blocked with iOS as the do not call list is worthless.

I have gotten it like 3 or 4 times now. I tried to call it back and it says the number is not in service.

This number has been calling me for 3 days now. I let it go to answering machine and they never leave a message. So grateful for this site letting me know others are experiencing the same and what it's all about. I believe they are foreigners trying to get private information. DO NOT PICK UP OR CALL THEM BACK! THEY HAVE THEIR PHONES WIRED TO GET PERSONAL INFORMATION !

Getting numerous calls from this number at all hours of the day, from early morning going calls that wake me up to much later in the day. I  don't answer, and they don't leave a message. A previous poster stated they were trying to say they wanted to give him/her a diabetes meter. I have had those calls before, but from a different scam number than this. Getting calls from this number on my landlines phone only so far.