"One mistake I've seen a lot of people make when upgrading to a new phone is forgetting that changing platforms often requires repurchasing apps," says Anjuan Simmons, an IT executive in The Woodlands, Texas, who is also a freelance writer and public speaker specializing in all things technology.
By platforms, Simmons is referring to your phone's operating system. Is it an iPhone or an Android?
So if you switch, for instance, from an iPhone to an Android, "any paid apps you've purchased from the Apple App Store will probably need to be purchased again from Google Play," he says, adding: "I call this the smartphone platform switch tax."
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U.S. News & World Report