Called to-day again never leaves a message

Received a call from this number but they hang up before the first ring ended. It's like someone's trying to see if my number is active or not.

Just got a call from the same #, no message.

I got this call about half an hour ago.............dead air when I answered. Ridiculous so early on a Sunday morning!

Called at 10am Sunday morning...no message

Called me on my landline here in Calgary a half hour ago.  I fortunately was not home at the time.  They didn't leave a message.  Looks like another one I'll be putting on my blocked list.