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The original iPhone had Safari, Youtube, Maps, Ipod (modern day "Music"), Phone/contacts, Calendar, Photos, Stocks, Weather, Clock, Calculator, Notes, and Settings
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Faster, More memory, video recording, improved camera, built in compass, voice control, Accessibility, comes with headphones.
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Front camera, FaceTime, had problems in lower left corner, smaller/thinner
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iCloud, iMessage, Notification Center, Reminders, and Twitter
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Lightning connecter, Panoramic photos, fingerprint scanner, Do Not Disturb
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More colors, Slo-mo, 64 GB
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Bigger, thinner, faster proccesing
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Burst, Timer
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No headphone jack. Longer battery.
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Different camera (horizontal)
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No button and face ID
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Better but smaller camera
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Bigger than iPhone X with same features
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Two&Three cameras