(arguably they should have just let the phones stop working instead of blocking them outright). The allowlist they used was missing hundreds of 4G capable phones and was missing just about every overseas model of phone
IIRC the issue is that phones must be able to dial 000 if there’s any mobile coverage at all. A bunch of VoLTE-capable phones either force 3G for 000 calls or aren’t compatible with Telstra’s custom VoLTE implementation, and there’s really no way for telcos to know these things.
There’s no way for the owner to know, either. A bunch of 4G+VoLTE phones in the wild that people think are fine either can’t call 000 or can’t call 000 on Telstra’s network. So a phone on Optus might work fine on Optus VoLTE, might call 000 fine on Optus VoLTE, but wouldn’t be able to call 000 if there was only Telstra network coverage.
And there’s no way for Optus to know which specific modem firmware your phone has, so even getting the same model phone and testing it isn’t a reliable solution.
quokka@aussie.zone 2 weeks ago
This is a pretty good rundown of how fucked it is medium.com/…/australias-3g-shutdown-telcos-to-blo… And now why there’s more interest in “restoring” IMEIs to compatible, but blocked, handsets than there was a year ago.