https://discuss.grapheneos.org/d/21731-cellbroadcastreceiver-permissions
CellBroadcastReceiver permissions - GrapheneOS Discussion Forum
GrapheneOS discussion forum
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https://android.googlesource.com/platform/packages/apps/CellBroadcastReceiver/+/refs/heads/master/tests/
tests - platform/packages/apps/CellBroadcastReceiver - Git at Google
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