[QUESTION] Best messenger for smartphone

What IM app do you use on your phones? I recently read Telegram is not actually as secure as I had initially though, obviously Whatsapp and Messenger are not something I would like to use. Also from an anonymity point of view, I would rather not subscribe with my phone number. Alternatives? What would you suggest to use as a secure chat app with at least basic functionality? (IM, VoIP and File Transfer) What is the absolute safest app out there? Are there any apps that are not free? (Where I am not in some way the product?)

Thanks for the help 🙂

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