Hi, I received my BV7000 three days ago and have the same issue, unable to transmit or receive voice calls, I initially thought this may be a sim problem and took my phone to the local Telstra Shop and the y checked the phone & android settings card to position 2 but I still had the problem. They tested my sim in another phone and it works fine, when I tried to check sim status I receive "Sim or Network error" message Internet worked ok and SMS ok. I carried out a factory reset but it has made no difference, Can these phones work with Australian sim cards??
Yes, Australian carriers are supported, as you can see here https://www.kimovil.com/en/frequency-checker/AU/blackview-bv7000-pro
I suggest to contact your seller to have your phone replaced under warranty, as i stated in my previous post.