Unknown number. No message left. Blacklisted the numbere

Caller claimed to be from Telstra stating that my mobile phone IP had been used on a public wi-fi and now was receiving multiple failed login attempts from all over the world. When I stated that was interesting as I am not on Telstra, he became very annoyed and lectured me about how Telstra network is the backbone and serves all providers. Clearly attempting to make me afraid of my phone security and create urgency to fix the issue. Classic scam.

Obvious scam call center. Lots of noise in the background, didn't seem to like that I didn't answer by introducing myself, and claimed to be from NBN internet provider I am not associated with.