I currently have an iPod 4G and my iPhone 5 is in process and it will be shipped next week. Now, I want to buy the Longman Dictionary app for academic purpose on my iPod at this time. I don't have enough money to buy the same app for 2 different devices, so can I use it on my new iPhone? I use for individual purpose only, not for any one Apple devices else and I have never bought any apps or even jail-broken. Th@nk for advices!