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
Signal Messenger is on the Apple store for their iOS devices. On GrapheneOS with no Google Play you can just download the APK from Signal’s website and install it