23Sha-ger Here is a link to Google's OTA-image download menu for the Pixel 9 Pro Fold: https://developers.google.com/android/ota#comet At present there are entries for Telstra, which I believe is an Australian carrier. I think it's quite plausible that the existence of a Telstra-specific image for some Pixel devices means that devices to which that image is flashed contain some Telstra-specific code! Might that code report details of the device configuration to Telstra? That seems plausible as well, though I have no idea whether it actually happens.
So... maybe this isn't common where you are... but where the original poster is, which seems plausibly related to the thread, a carrier-specific app seems quite within the realm of possibility.