The conspiracy theories about Apple slowing down old iPhones have some truth to them.
Many people say once a new iPhone comes out their older phones feel sluggish. They believe Apple does this intentionally to get people to upgrade.
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Apple has admitted it is slowing old phones -- the 6, 6-S and 7, but the company said it is actually because of the old batteries.
Apple says it's intentionally throttling the speed of phone processors, to prevent random shutdowns.
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Tech experts said now that we know this, you could speed up your old phone just by replacing the battery, which is much cheaper than buying a brand new phone.