What is "wrong numbers"

Usage examples of "wrong numbers".

He studied the note he'd made, wondering if he'd written down the wrong numbers, and tried to phone again.

Hank's first attempts to use it had led to wrong numbers on which he hastily hung up.

I erased the breathing messages and told myself they were wrong numbers.

But thing that drove Alvarez crackers was that phone numbers for Adam were reported and every time they turned out wrong numbers.