was like someone was walking and immediately hangs up

This number called me and hung up when I answered

Received a text message form this number saying test sms. I also received 2 other messages at the same time from 2 other numbers - 0407 707 697 and 0423 896 876 - and both said the same. I have also recently been hacked and I am now getting a lot of these phishing tests/ emails... I'd block the sender straight away.

Said hello twice hung up called a second time same thing. Must be scammer

Waited until phone had been answered, silence, then hung up. Didn't answer when tried to call them back.