On mobile there are various options. The apps which are likely to be most secure are ones which have end-to-end encryption enabled by default and which can also be onion routed via Orbot. End-to-end encryption secures the content of the message and onion routing obscures the metadata, making it hard for a passive adversary to know who is communicating with who.
I’m sorry but this sounds like FUD from someone trying to get people to use less secure systems. For everyday messaging Signal is the best private messaging client out there (that is - you can be safe knowing nobody is intercepting your messages). If you want something decentralized that won’t share your profile with your friends/family, use Sessions or Briar. No need to dissuade people away from Signal just because you didn’t understand how it works.
Okay, I see that you’re very unhappy because of my thoughts and you’re showing it in every response. I’m totally ok with that, but if you could tell me one thing: are you white cis hetero male from usa/europe/australia? Just need to know if it’s worth to engage.
That would be for “yes” I suppose? Okay, okay - sorry, I don’t actually want to attack you anyhow or LMAO around - I just want to point out that it’s nice to imagine that “to be secure/to feel secure” is really not under control of someone’s privileged point of view. All what we’re talking about - just a reminder - that the question was about the MOST secure app. You’re accusing me of “trying to get people to use less secure systems” or “dissuading people away from Signal”. What can I say about it? I feel so deconspired that getting out is really the only option for me!
But maybe you could consider to really get in, huh?