Looking at the Android source code, it looks like you're right: > Presidential alert is default on and cannot be turned off. https://cs.android.com/android/_/

Looking at the Android source code, it looks like you're right: > Presidential alert is default on and cannot be turned off. https://cs.android.com/android/_/android/platform/packages/apps/CellBroadcastReceiver/+/70b77474601a12e44692ef0af246027f84b8d08c:res/values/overlayable.xml;l=42 https://cs.android.com/android/_/android/platform/packages/a... > CMAS Presidential must be always on (See 3GPP TS 22.268 Section 6.2) regardless [of the] user's preference https://cs.android.com/android/_/android/platform/packages/apps/CellBroadcastReceiver/+/70b77474601a12e44692ef0af246027f84b8d08c:src/com/android/cellbroadcastreceiver/CellBroadcastConfigService.java;l=118 https://cs.android.com/android/_/android/platform/packages/a... > A CMAS-capable User Interface (UI) shall support the ability for the user to opt-out of only the Imminent Threat and Child Abduction Emergency Warning Notifications. When a Presidential Warning Notification is received, it is always presented to the user whenever Cell Broadcast Service via GSM/UMTS or warning message delivery via E-UTRAN is enabled on the UE. https://www.etsi.org/deliver/etsi_ts/122200_122299/122268/10.02.00_60/ts_122268v100200p.pdf https://www.etsi.org/deliver/etsi_ts/122200_122299/122268/10... Seems like no one working in the Canadian government has heard about The Boy Who Cried Wolf.