Changed NBN from TPG to Telstra. Except that Telstra cannot connect me for "technical" reasons. The 4G back-up runs at single digit (read 1) Mbps. Four times I have been told it will be 1 - 2 business days, so that's eight days so far and not resolved.I only changed from TPG because they couldn't replace a damaged SIM without seeing a text to the SIM that doesn't work.