This number called me claiming to be from the CommBank cyber security team. They said that I had a fraudulent transaction on my account, "which they locked down". They were trying to get me to download an application from play store/app store. This was was an obvious attempt to seek credentials from me.
The caller was Indian and calling from a very noisy call centre, where I could hear other Indians making calls.
Old mate hung up when I told him I didn't have a smart phone.