Apple just gave owners of older iPhones 4 great reasons not to upgrade to a new device

Apple is making some big announcements at WWDC 2019 about the iPhone performance improvements coming with iOS 13, the latest upcoming version of Apple's iPhone operating system.

iOS 13 will supposedly make apps launch faster, reduce the amount of space apps use up, and speed up Face ID unlocking.

App launch speeds, storage needs, and Face ID unlocking speeds are great improvements that could stop you from buying a new iPhone because your current iPhone is too slow.

If you're looking to buy a new iPhone because of battery life issues, you might exchange the battery instead and wait for the new iOS 13 to see if it breathes new life into your old iPhone, which would save you some cash.

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Apple announced on Monday its upcoming version of the iPhone operating system — iOS 13 — that the company said will bring some key improvements to iPhone performance, at least those that will support iOS 13.

With iOS 13, Apple claims your iPhone will launch apps faster, the amount of storage apps use up will be reduced, and Face ID will become faster, too.

Apple's Craig Federighi didn't specify which iPhone models will experience these performance upgrades. But since the upgrades are coming to iOS 13, it's likely that all iPhones that support iOS 13 will reap the benefits of Apple's work over the last year.

Check out the performance improvements coming to iPhones running iOS 13, which Apple says is rolling out this fall: