Pocketbook has just released a new e-reading app for the Apple iPhone. This app is certified with Adobe, so you can enter your Digital Editions ID to import books with DRM. It is a solid first effort and the functionality of the app mirrors the one they released on Google Play last year.
Pocketbook has been making e-readers since 2009 and normally released three new devices a year. They have been focusing on app development for the last year, with a number of reading apps. The iPhone app does not have a ton of functionality but will allow you to change the sizes of the fonts, adjust the font type or make highlights.
The app has some limitations, such as the inability to buy books directly from Pocketbook. Instead, you have to import them onto your phone, which puts up barriers for ease of use. One of the benefits is that you can import in eBooks that are in the standard EPUB format, that you might have downloaded from the internet.