Need something achievable for an extremely tech illiterate person on iOS. I got told about this after they are already gone and have no access to the device, but am asked to solve the problem.
EDIT: (SOLVED) Signal was super easy, works awesome, and was easy even for my mom to figure out on her own. Thanks
These are probably less ideal for the tech illiterate, but they are available for iOS and haven’t been mentioned yet:
Session
Element / Matrix (edit to note someone else did already mention element above in the thread)