Let's not have sim pin handling in multiple places
We have sim handling via gnome-settings-daemon (although we don't ship it on the devkit) so I wonder if it's the right approach to handle sim handling again in chatty? @mohammed.sadiq is working on similar things in gnome-control-center / gnome-settings-daemon. We don't want to store the sim in unlocked memory (https://source.puri.sm/Librem5/gnome-settings-daemon/issues/2) but use gnome-keyring for that.
Also this might waste precious retries when the user changes it's pin via g-c-c- (which can update the pin stored in the keyring)
cc: @bob.ham (since calls needs the sim unlocked as well)
i've moved the comment from !2 (comment 43133) over here.
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