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Unfortunately, most of these new features do not function on older Apple devices like iPhone 4, due to limitations. Some apps even require at least iOS 7 to work properly.
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Apple's iOS 8 for iPhones comes with several improvements and lots of new features like Apple Pay and SMS Relay.

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That does not however mean that you cannot get a compatible version of the app installed.

Below are 4 simple steps to get it done:

You can try installing other apps this way too but note that this only works with apps that have been around since iOS 6. Only then would there be a version built for iOS 6 aka the "compatible version" you can fall back on.

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