Thanks for your comment it gave me a lot of thoughts like: "Why did I think that my blackberry was secure (or more secure than other phones)?"
TLDR: I couldn't find the answer but I think it's because they were the first major smartphone and had a encrypted messaging app.
Here's a few sources for further reading.
Obligatory Wikipedia Overview: https://en.m.wikipedia.org/wiki/BlackBerry_Limited
Blackberry had early smartphones and went all in on keyboard phones:
https://d3.harvard.edu/platform-digit/submission/the-rise-and-fall-and-rise-again-of-blackberry/
Sorry I couldn't have been more helpful, but hopefully this gives you a good starting point.
Radarr might be the way to go depending on your situation.