Who called from 7704505093

Called 3 times in a row and left no message, so I blocked it.

Is this one if those "yes" scheme??
They only ask "yes ". "No".
Beginning is "can you hear me?
That is a scheme to get you recorded to say "yes". And they can use that to scam you.

The danger may be somewhat over-stated, but why take chances?  Who wants to talk to crooks in the first place?  No good can come of that.

Thanks for reply.  Us seniors are always afraid of scams.