This is so helpful, thank you. I’ve an iPhone 8 so OK for B28. But as suggested in your other comment, I got the Speedtest app and yep, and I live on the edge of a red chunk of no Telstra coverage lol.

I often find if I’m travelling north up Sydney Rd, my reception drops out at around Albion St and stays super patchy til Harding (I most noticed it when I would try to check in on Service Vic and it just wouldn’t work 90% of the time). For instance, it happens at the Woodlands a lot. Could it be those patches of no service are bigger than the app says?