GrapheneOS always considers the network to be hostile. Merely getting a silent SMS is - not a good indicator of being targeted by your cell carrier, police or government - because anyone on the cell network can send them. Cellular triangulation will - happen regardless of whether or not SMS texts are being sent or received by the phone, - and they don't have to even be a silent SMS; it wouldn't be much different than - receiving an unsolicited spam SMS!
+GrapheneOS always considers the network to be hostile and does not implement weak + or useless mitigations. Therefore, it does not have a assorted gimmicks seen elsewhere + providing privacy/security theatre to make users feel better about these issues. One + of the core tenets of GrapheneOS is being honest with users and avoiding scams/frills + based around marketing rather than real world privacy/security threat models.
Activating airplane mode will fully disable the cellular radio transmit and receive capabilities, which will prevent your phone from being reached from the cellular @@ -344,6 +343,24 @@ cellular radio, but Wi-Fi can be re-enabled and used without activating the cellular radio again. This allows using the device as a Wi-Fi only device.
+Even if interception of the connection or some other man-in-the-middle attack along + the network is not currently occurring, the network is still untrustworthy and + information should not be sent unencrypted. Legacy calls and texts should be avoided + as they're not secure and trust the carrier / network along with having weak security + against other parties. Trying to detect some forms of interception rather than dealing + with the root of the problem (unencrypted communications / data transfer) would be + foolish and doomed to failure.
+ +Receiving a silent SMS is not a good indicator of being targeted by your cell + carrier, police or government because anyone on the cell network can send + them including yourself. Cellular triangulation will happen regardless of whether + or not SMS texts are being sent or received by the phone. Even if an SMS did serve a + useful purpose for tracking, a silent SMS would be little different than receiving + unsolicited spam. In fact, sending spam would be stealthier since it wouldn't trigger + alerts for silent SMS but rather would be ignored with the rest of the spam. Regardless, + sending texts or other data is not required or particularly useful to track devices + connected to a network for an adversary with the appropriate access.
+