Just got a call from this number claiming to be from Telstra. I wasn't able to catch their first name but remember their surname as 'Anders'. They claim that your network has changed from private to public, asking if you've made any changes on your end. After stating I'm not with Telstra, they hung up. Definitely a scam call. Also conscious that it could be a scam call centre spoofing people's mobile numbers so keep that in mind.