Have been to settings General/Mobile /mobile data options no selection to show VoLTE
I have switched airplane mode on and off and reset rework settings
VoLTE shows up on my old iPhone A1723 SE 1st generation when I put my SIM card in that
IOS 18.1
Mac mini, macOS 10.15
Thanks to all it confirms what I thought the USA model doesn’t work on that band for Telstra might work on Optus have got in touch with the place I brought the phone and negotiating a trade in on for them to supply the Australian model
Contact your carrier for help with your carrier services. It's entirely on their side.
If I'm not mistaken, Telstra's 4G network in Australia relies heavily on FDD-LTE band 28. The U.S. version of the iPhone SE (2nd generation) supports a number of 4G FDD-LTE and TD-LTE bands, but FDD-LTE band 28 is not among them.
Therefore, now that Telstra has shut down, or is shutting down, their 3G service, you might have trouble getting Telstra service with that particular variant (U.S. variant) of that particular iPhone.
iPhone SE (2nd generation) - Technical Specifications - Apple Support
This might force you to switch to a different carrier, a different phone, or both.
Sorry, but you will not be able to use that phone on a Telstra network. You can check with Telstra support to confirm.
As for your first-generation iPhone SE, model A1723 is a "Global" model that supports LTE band 28. (I assume that plain "LTE" here refers to the same thing that "FDD-LTE" does elsewhere.)
iPhone SE - Technical Specifications - Apple Support
Every.com (EveryMac.com) – iPhone Q&A
This is probably why it works with Telstra where your other iPhone doesn't.
my iPhone se2020 US model A2275 does not show voLTE on Telstra network
