Beeper's developers worked over the weekend and have since gotten the app partially working again, but Apple has made it clear that it intends to keep the cat-and-mouse game going until Beeper gives up.
Apple would go on to expand those features, bringing iMessage to more devices, adding in-chat apps, voice recordings, Animoji, and more, but the fundamental understanding that an iPhone got you a built-in way to message for free was a powerful draw in the early days of the iPhone.
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