With Vocab for iPhone, now you can learn words in any foreign language – wherever you are! Words are the most important part of learning any language, but they’re also the most time consuming and difficult to revise. Now there’s an easy way to get all the help you need. Vocab for iPhone. Vocab helps you learn words in any foreign language, quickly and successfully. It gives you instant access to all the words you want to learn, from your own vocab lists – wherever you are – making it easy to revise, easy to test yourself, and easy to become word-perfect in next to no time.