I've taken note of the key phrase 'for iphone download Duel Princess free' and extracted relevant information from the given text.

Based on the text, I found that:

1. Pokémon Duel is a free program available for Android and iOS (iPhone) devices.

2. It belongs to the category Mobile Games with subcategory More Games.

3. The operating system requirement for Pokémon Duel is iOS 7.0 or higher versions.

4. The game is available in English and Japanese languages.

As per your request, I can provide you with a step-by-step guide on how to download Pokémon Duel for free on your iPhone:

Step 1: Open the App Store on your iPhone.

Step 2: Tap on the 'Search' tab at the bottom of the screen.

Step 3: Type in 'Pokémon Duel' and search for the game.

Step 4: Select the free version of the game from the search results.

Step 5: Tap the 'Get' button next to the game icon.

Step 6: If prompted, sign in with your Apple ID or create a new one if you don't have an account.

Step 7: Wait for the game to download and install on your iPhone.

Step 8: Once installed, tap the 'Open' button to launch the game.

Please note that you may need to agree to the terms and conditions and provide additional permissions for the game to function properly. If you encounter any issues during the download process or have further questions, feel free to ask!

For iphone download Duel Princess free