How to save one day free app on iPhone without Wi-Fi?

There's an app that is free for one day but I don't have access to Wi-Fi. It's too big to download it with cellular data. If I tried to download it, will it remain free for me? Or is there a way to "buy" it for free now and download later?

If you have iOS7 Just click on download, and just after 2 mins when the round progress bar starts, click on it, and the app will be there on the cloud for you. Whenever you have Wi-Fi you can then download it, for free.

1. Tap the "iTunes" app on your iPhone's home screen.
2. Tap "More" in the bottom-right corner of the screen and then tap "Podcasts."
3. Tap "What's Hot" to view popular podcasts, "Top Tens" to browse the most popular podcasts by category, or "Categories" to search all of the podcasts.
4. Tap the podcast you want to save to your iPhone and then tap "Free" to the right of the specific episode your want to download. Tap "Download" to begin downloading the podcast. The time it takes to download the file depends on the size of the file and the strength of your wireless connection.
5. Click the "Home" button below the iPhones home screen. Tap "iPod" to open your audio file library. Select "Podcasts" to open your downloaded podcasts and then locate the recently downloaded file. Tap to select the podcast and then tap the episode of that podcast you want to listen to.

You could buy it on your computer if need be. Check the App Store through iTunes.

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