The Meshtastic iOS app is currently available in TestFlight as a public beta with a projected App Store release in early 2022.
There are plenty of remaining beta spaces available and there are no codes.
iOS 15 is required and you can sign up by opening the following link on any iOS device with TestFlight installed.
An alpha MacOS application is available in the beta TestFlight app for MacOS currently available to Apple developers.
Code from two previous community projects is also available.