Ask HN: How is FB Messenger on ios in terms of privacy?

I recently switched to an iphone from an android. Up until this point, I've avoided downloading Messenger because my old android phone was running an outdated version of android and didn't come with privacy guards. I now have an iphone SE, and I was curious after reading all the articles about the pro-privacy stance on the iphones, will ios provide safeguards against messenger doing shady things, like:

- Secretly opening the mic to listen in on conversations

- Block Messenger from accessing phone contacts, call history, and text messages

- Block Messenger from accessing my phone number, so that other people can't auto-sync me on their phone using their contacts list.

And any other sorts of weird things? A lot of my friends only use facebook, so I'm still tied to it. I also don't want to use a browser on the phone, because that is super clunky, so I'm thinking of using the native app. I tried looking for an open source privacy-friendly version for ios, but they are nonexistent.