Not an attack or anything but just curious... is there a reason why?
Mostly past experience. Was with Optus, Exetel and Amaysim (Optus MVNOs) from 2010-2015 and had:
- consistent reception issues where I lived around inner west Sydney. Ended up finding a workaround which involved turning off the UMTS 2100 band entirely through my Galaxy S2's modem service menu and only ever using UMTS 900. This sacrificed bandwidth for usable signal and fewer dropouts
- consistent network performance issues anywhere near a large groups of people - live events, train stations during peak hour, etc. My memory's a little hazy on this, but I think the UMTS 900 trick helped with this because many phones at the time preferred the more congested UMTS 2100 band where possible. In some cases the network got bad enough that I'd turn off 3G entirely and switch to GSM just to make a phone call
- consistent cell handover problems, catching the train into the Sydney CBD on weekdays there were two dead spots around Everleigh and Ashfield/Croydon where the cells seemed incapable of handing over 1000+ handsets (on a full train) simultaneously. Calls would drop and data connections would freeze for 60-90 seconds, could be manually reset by flicking aeroplane mode on and off. Interestingly this didn't happen during uncongested periods which is why I think it would a network capacity issue.
- zero reception in most multi-story building basement carparks
The only reason I stuck with Optus was state of the Vodafone network (at the time) and the $30-40/month premium on Telstra. That premium has since dropped quite a lot.
I ported to Telstra in 2015 (new job covered my phone bill) and all of these problems went away. Having been on Telstra for nearly 6 years now, if work stopped covering my bill costs tomorrow I'd almost certain stick with Telstra and wear the cost, or possibly consider Vodafone if I was going to be roaming a lot. The Voda network has improved significantly since those times.
I'm with Optus and struggle to see why people would be with Telstra unless you travel proper bush.
I don't think you need to go 'proper bush' to see the difference. I did the Evans Lookout walk in the Blue Mountains late last year - it's in a valley about 10km from Katoomba as the crow flies. Friends on both Voda and Optus lost reception entirely at the car park where the hike starts, yet I had 3/4 bars 4G on Telstra. Plausible that Voda and Optus lost a tower in the bushfires and hadn't yet reconstructed it, but it had been 9 months so