Most iPhones last three to five years before hardware fails or software stops supporting them

An iPhone typically remains usable for three to five years, depending on how you use it and which model you own. After that window, the battery degrades significantly, newer iOS versions may run slowly on older hardware, and repair costs often exceed the price of a newer phone. You don't have to replace your iPhone on a schedule—you replace it when the device stops meeting your needs or becomes unreliable.

The actual lifespan varies. An iPhone 14 bought today will likely work acceptably through 2027 or 2028. An iPhone 11 from 2019 may still power on in 2024, but its battery will hold a charge for only a few hours, and the latest iOS updates may stall on it. The deciding factor is usually not age alone but whether the phone still does what you need it to do.

Key Takeaways

  • Most iPhones remain functional for three to five years, after which battery degradation and software slowdowns become noticeable.
  • Apple typically supports iPhones with iOS updates for five to six years from release, so older models eventually stop receiving security patches.
  • Battery replacement costs $50 to $70 at Apple, but if your phone is already three years old, a new device often makes more financial sense.
  • Physical damage, water damage, or a cracked screen may force replacement sooner than age alone would suggest.
  • Selling or trading in an older iPhone can offset the cost of a replacement, especially if the device still powers on and holds a charge.

Battery degradation is the most common reason to replace an iPhone

Your iPhone's battery loses capacity every time it charges. Apple designs batteries to retain 80 percent of their capacity after 500 full charge cycles. By year three, most iPhones drop below 80 percent. By year four or five, the battery may hold only 50 to 60 percent of its original charge, meaning the phone dies in the afternoon even if you started the day at 100 percent.

You can check your battery health by opening Settings, tapping Battery, then Battery Health & Charging. If the number is below 80 percent and your phone is more than two years old, a battery replacement from Apple costs $50 to $70 depending on the model. However, if your phone is already three years old and the battery is at 60 percent, you may spend $70 on a battery only to face other failures within a year. In that case, buying a new iPhone makes more sense financially.

Some people notice their phone slowing down when the battery is weak. This is intentional—iOS throttles performance on low-capacity batteries to prevent unexpected shutdowns. Once you replace the battery, the phone speeds up again. But if your phone is already old, this temporary fix may not be worth the cost.

iOS updates eventually stop supporting older hardware

Apple releases a new iOS version every September. Each version typically supports iPhones from roughly the past five to six years. For example, iOS 18 (released in 2024) supports iPhone XS and newer. If you own an iPhone X or older, you cannot install iOS 18, which means you stop receiving security patches and bug fixes.

Running an unsupported iOS version is not when ready dangerous, but it leaves your phone vulnerable to security flaws that Apple no longer patches. If you use your iPhone for banking, email, or shopping, an outdated OS is a real risk. You can continue using an older iOS version, but you should avoid entering sensitive information on an unsupported device.

Check which iOS your phone runs by opening Settings and tapping General, then Software Update. If the screen says "Your software is up to date" but your phone is five or six years old, you may be on the last iOS version that device will ever receive. At that point, replacement becomes a security consideration, not just a convenience one.

Physical damage and water damage often make replacement the only option

A cracked screen, a phone that no longer charges, or water damage can force replacement even on a relatively new device. Screen repairs at Apple cost $150 to $400 depending on the model. Charging port repairs or water damage repairs can cost $300 to $500 or more. If your phone is only two years old and the repair is $300, replacement may be cheaper or only slightly more expensive.

Water damage is particularly tricky because the damage may not show up when ready. A phone that survived a drop in water may work fine for weeks, then suddenly fail as corrosion spreads inside. Apple does not cover water damage under warranty, so repair costs are out of pocket. If your phone has been wet and you are uncertain whether it will survive, consider replacement rather than gambling on a repair.

Some damage is repairable at third-party shops for less than Apple charges, but third-party repairs may void any remaining warranty coverage. If your phone is already old, the warranty is likely expired anyway, so a cheaper repair makes sense. If your phone is new, an Apple repair preserves your coverage.

Performance slowdowns signal that your iPhone is aging

An iPhone that takes five seconds to open an app, freezes when you switch between programs, or stutters while scrolling is showing its age. This usually happens when the phone is three to four years old and the processor is struggling to run newer apps designed for faster hardware. Closing background apps or clearing cached data may help temporarily, but the underlying problem is that the hardware is outdated.

Slowdowns can also result from a full storage drive. If your phone is nearly full, clearing photos, videos, and old apps can restore speed. Check your storage by opening Settings, tapping General, then iPhone Storage. If you are using more than 90 percent of available space, delete old photos or videos and see if performance improves. If the phone is only half full and still slow, the processor itself is the bottleneck.

Performance issues are frustrating but not urgent unless they prevent you from using the phone for work or safety. Many people tolerate a slow iPhone for another year or two. But if slowness is affecting your daily use, replacement is a reasonable choice.

Comparing the cost of repair versus replacement

Before you replace your iPhone, compare the repair cost to the price of a new one. A battery replacement is almost always worth doing if your phone is less than three years old. A screen repair is worth doing if your phone is less than two years old and the repair costs less than half the price of a new device. A charging port repair or water damage repair is rarely worth doing unless your phone is very new.

Use this rough guide: if the repair costs more than 50 percent of the price of a new iPhone in your area, replacement is the better choice. If the repair costs less than 25 percent, repair is clearly better. In the 25 to 50 percent range, consider how old the phone is and whether you expect other failures soon.

You can also trade in your old iPhone to offset the cost of a new one. Apple's trade-in program offers $50 to $400 depending on the model and condition. Carrier trade-in programs and third-party sites like Gazelle or Back Market may offer different amounts. Check multiple options before deciding to replace.

Selling or trading in your old iPhone can reduce replacement costs

If your iPhone still powers on and the screen is not cracked, you can sell it or trade it in rather than throwing it away. Apple's trade-in program accepts iPhones up to about eight years old, though older models receive lower values. Carriers like Verizon and AT&T also run trade-in programs, sometimes offering higher values than Apple to encourage upgrades.

Third-party resale sites like Gazelle, Back Market, and eBay may offer competitive prices, especially for phones that are only two or three years old. Selling directly to another person through Facebook Marketplace or Craigslist often brings the highest price, but requires more effort and carries some risk. Whichever route you choose, wipe your data first by opening Settings, tapping General, then Transfer or Reset, and selecting Erase All Content and Settings.

The money from a trade-in or sale does not fully offset the cost of a new iPhone, but it reduces the out-of-pocket expense. A three-year-old iPhone in good condition might trade for $200 to $300, bringing the effective cost of a new phone down by that amount.

Frequently Asked Questions

Can I keep using my iPhone if it is no longer supported by iOS updates?

Yes, the phone will continue to work, but it will not receive security patches. If you use it only for calls and texts, the risk is low. If you use it for banking or shopping, the lack of security updates is a real concern. Consider replacing it or at least avoiding sensitive transactions on an unsupported device.

Is it better to replace my iPhone or repair the battery?

If your phone is less than three years old and the battery is below 80 percent, a $50 to $70 battery replacement usually makes sense. If your phone is already three or four years old, a new device is often a better long-term investment because other components will likely fail soon after.

How do I know if my iPhone has water damage?

Open Settings, tap General, then About. Look for a Liquid Detection Alert. If it appears, your phone has detected moisture. You can also check the SIM tray—if there is a red or pink indicator inside, water has reached the internal sensors. Either sign means water damage is present.

What should I do with my old iPhone after I replace it?

Wipe all your data by going to Settings, General, Transfer or Reset, and selecting Erase All Content and Settings. Then trade it in through Apple, your carrier, or a third-party site, or sell it privately. Do not throw it away—iPhones contain valuable materials and hazardous chemicals.

Will my iPhone last longer if I replace the battery before it gets too old?

A battery replacement can extend your iPhone's usable life by one to two years. If you replace the battery at 80 percent capacity (around year two or three), you may get another two years of reliable use before other components fail. After year five, replacement is usually more practical than repair.