If you try to buy MP3s using Amazon’s iOS app, you’ll see a warning that says “This mobile application does not currently support digital downloads. Add this item to your Wish List and you can view and purchase it from your computer.”
As of today, however, Amazon has figured out a way around what we presume to be Apple’s edict that it not sell MP3s within its app, which would compete directly with iTunes. Now, anyone who wants to buy MP3s from Amazon, directly from their iPhone, iPad, or iPod Touch, can do so by directing their browser to Amazon.com/MP3. Regular shoppers can set that website as a bookmark, and then add the bookmark to the iOS homescreen, which would make the store feel exactly like a native iOS app.
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