Apple and others have always insisted that there is no such thing as a safe backdoor, and that if one person has access, then it's only a matter of time until others gain access, too.

In a recent security warning, the FBI and the US Infrastructure Security Agency have warned people to use encrypted apps such as iMessage and FaceTime for communication in order to retain security resilience against foreign hackers.

They also warn people to avoid using Rich Communication Services (RCS) when sharing messages between iPhones and Android devices, as RCS does not yet provide end-to-end encryption. (It is allegedly coming eventually, according to RCS standards body, the GSMA). What this means is that Android and iPhone users should probably consider installing Signal for cross platform communications, which does provide cross-platform encryption.

Apple also continues to invest in encryption technologies to protect its customers, and recently introduced upgraded protection against future high-level attacks that use quantum computers to break into your communications.