TIER (and some other apps) freeze when they can't get a GPS fix

sjors

I don't have a GPS signal indoors and several apps don't handle this gracefully. Since I've never used stock Android, I'm not sure if this is really a GrapheneOS issue. I do know that the same apps on iOs work fine.

It should be possible to reproduce this without creating an account (which is another issue).

Find a place with no GPS signal (and no wifi fallback, I guess?). In Google Maps you'll see a grey dot instead of a blue one.

Start the TIER app. Give it location permission when it asks. Click on the phone number login. See a small logo spinner forever. Kill the app and try again outside: you'll get a prompt to enter your phone number (though impressively it still guesses the wrong country).

Enabling Exploit compatibility mode didn't help.

MetropleX

sjors Enabling Exploit compatibility mode didn't help.

I've noticed this in your other thread, please DO NOT keep toggling this for things it isn't intended for, please read this to familiarize yourself with it's purpose, it is not a panacea:
https://grapheneos.org/usage#bugs-uncovered-by-security-features

The reason TIER location might not work indoors, is that by default all location requests are directed to the OS Location APIs which depend on GNSS/GPS only. This means in most cases you will need line of sight to the sky to enable GPS satellite lock. You could try using GPSTest to get a lock first, then opening TIER.

If you wish to use location indoors, you will need to (as I know you've already done from your other thread) ensure you have sandboxed Play Services installed. Tap the persistent notification for Play Services running. Then at the bottom toggle off the location OS redirect then read this to enable Googles network based location service, which will help location to be gained indoors via wifi and bluetooth:
https://grapheneos.org/usage#sandboxed-google-play-configuration

Beyond that please take some time to read all of the detailed documentation on grapheneos.org from the features, usage, FAQ pages in particular.