As a lawyer - this is the messaging app to use
If you are coordinating with co-counsel, clients(!), your staff, or witnesses and you are communicating legally priviliged information - this is the app your state’s bar will require soon enough. End-to-end encryption, the app is locked with it’s own password and all texts are encrypted within the locked app. Self destruct on failed login (x10) and a host of nice features that you control. Send read receipts? You decide. Send “typing” notice-again, your choice. An exclusion list - check. Revoke an ID and generate a new one - check. Runs on iPhone & iPad. IPv6, video chats with option to save the encrypted media, or export to camera roll. Just slick.
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Threema. The Secure Messenger