Just a heads-up, the iPhone/iPad app Metatext is no longer being maintained. The lead developer had to take a break due to health issues.
If you want a good iPhone/iPad Mastodon app, try Toot! (more info: https://fedi.tips/toot-for-iphone-ipad/) or Ice Cubes (more info: https://fedi.tips/ice-cubes-for-iphone-ipad/) or Ivory or one of many other nice Mastodon apps now available.
Metatext may still come back in some form, community developers are currently testing a new fork, but it's not quite ready yet.