In general, you should install apps outside of your phone's app store only if you have a very good reason to.

It's never been easier to get started as an app or game developer - here's all you need to know in order to start developing an iPhone or iPad app and get it on to Apple's App Store.

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You'll have to go into your settings to trust non-App Store apps on an iPhone. Here's how to make your iPhone trust these apps so you can use them.