Scam call from a call centre in India or somewhere pretends to be from Teltra. Asks about what devices you have (doesn't seem to care whether you are actually with Telstra though). Pushily tells you to put him on speaker and open up AppStore so he can help you download a firewall to fix your internet problem. Never asked if I even have a problem. Hangs up when you show any sign that you are on to him. I let these people go on as long as possible so they have less time to annoy more vulnerable people.