Does this apply to grapheneOS as well, or they only can scan ordinary android / ios ?
SIGNAL IS MORE SECURE THAN MOST ALTERNATIVES.
IF YOU ARE A TARGET, GOVERNMENTS WILL COMPROMISE PHONES, AND EVERYTHING ON THEM.
THIS IS WHY SIGNAL AND SIMPLEX HAVE THE AUTO DISAPPEARING MESSAGES FEATURE.
https://cdn.satellite.earth/0f840814e8768d604a3215e037874cf197830984b26247e0f68bcf3eda65c5a1.mp4
Discussion
GRAPHENE IS MOST SECURE FROM TARGETED ATTACKS.
A FULLY UPDATED IPHONE 15 OR16 IN LOCKDOWN MODE SECOND BEST.
WE NEED TO ONBOARD GRAPHENEOS TEAM TO #NOSTR 
I believe the act of having a physical sim card severely compromises your privacy. Telecom networks are built to track by default. Being Ed Snowden requires dedication beyond mere mortals.