0.19 finally brings Prime support to iOS. This includes all the current features of Prime, including the removal of ads, unlimited campaign skips, two extra icons, and two extra colors.
If you're interested in trying it as soon as possible, please join the beta on Testflight. Purchases made on Testflight versions will not actually charge you, but will also not be available outside of Testflight versions.
The Prime in-app purchase is now available to all iOS users.