How to know when your iPhone is ready to be replaced

Your iPhone is ready to replace when the battery no longer holds a charge through a full day, the screen cracks or stops responding to touch, or the phone regularly freezes and crashes during normal use. These are the three most common hardware failures that make a phone unreliable for daily tasks. A phone that restarts on its own, won't turn on without being plugged in constantly, or has a swollen battery (which looks like the back is bulging) should be replaced when ready for safety reasons.

Age alone is not the deciding factor. An iPhone from five years ago that still powers on, holds a charge, and runs apps without crashing can keep working. What matters is whether the phone still does what you need it to do. If you can work around the problems—carrying a charger, using a screen protector over cracks, restarting the phone when it freezes—you can keep using it. But if the problems interfere with calls, texts, or work, replacement makes sense.

Key Takeaways

  • Battery failure is the most common reason to replace an iPhone; if your phone dies before evening with normal use, the battery has degraded beyond practical repair.
  • Screen damage that prevents the phone from responding to touch, or a battery that swells visibly, means you should stop using the phone and replace it.
  • Software slowdowns and crashes often improve after a restart or after deleting unused apps, so try these steps before deciding the phone is too old.
  • iPhones typically remain reliable for three to five years; after that, battery degradation and hardware wear become more frequent.
  • Checking your battery health in Settings > Battery > Battery Health & Charging tells you whether the battery is the actual problem or whether something else is slowing the phone down.

Battery degradation: the most common replacement trigger

iPhone batteries degrade over time and lose the ability to hold a charge. After roughly 500 full charge cycles—which takes about two years of normal use—a battery typically retains 80 percent of its original capacity. After three years, it may hold only 70 percent. This is normal chemistry, not a defect.

You can see your battery's actual health by opening Settings, tapping Battery, then Battery Health & Charging. The number shown is the maximum charge your battery can hold compared to when it was new. If it shows 80 percent or higher, the battery is still in good condition. If it shows below 50 percent, the phone will struggle to power through a full day, and replacement is practical.

Before replacing the phone, try these steps: reduce screen brightness, turn off background app refresh for apps you do not use constantly, and enable Low Power Mode in Settings > Battery. If the phone still dies by mid-afternoon with light use, the battery has degraded too far to be practical, and replacement is the next step.

Screen damage and touch responsiveness problems

A cracked screen that still displays images but does not respond to touch, or a screen that flickers or shows dead pixels, means the display hardware is failing. Small cracks in the corner that do not affect use can be left alone. But if the crack runs across the area where you tap most often, or if large sections of the screen do not respond, the phone becomes difficult to use.

Before assuming the screen is broken, restart the phone by holding the power button and volume button together until the power-off slider appears, then slide to power off. Wait 30 seconds and power back on. Sometimes a software glitch makes the screen appear unresponsive when the hardware is fine. If the problem returns after restart, the screen hardware is likely damaged and replacement is the practical choice.

Freezing, crashing, and restart loops

An iPhone that freezes during normal tasks, crashes out of apps, or restarts on its own is usually running into a software problem rather than a hardware failure. The first step is always a restart: hold the power button and volume button until the power-off slider appears, then slide to power off. Wait 30 seconds and power back on. This clears temporary memory and fixes most crash problems.

If crashes continue after restart, check how much storage space is left. Open Settings, tap General, then iPhone Storage. If the phone shows less than 1 gigabyte free, delete photos, videos, or unused apps until you have at least 2 to 3 gigabytes available. A phone with almost no free storage will crash and freeze constantly.

If the phone still crashes after freeing up storage, the issue may be a specific app. Try using the phone in Safe Mode to see if crashes stop: hold the power button and volume button until the power-off slider appears, slide to power off, wait 30 seconds, then power back on and when ready hold the volume-up button until the phone fully loads. If the phone works smoothly in Safe Mode, an installed app is causing the problem—delete the app that was most recently installed before the crashes started. If crashes continue even in Safe Mode, the phone's storage hardware may be failing, and replacement is the next step.

Physical damage and swelling

A phone that has been dropped in water, exposed to extreme heat, or physically bent should be inspected for internal damage. Water damage is not always visible when ready—the phone may work for days or weeks before the corrosion causes problems. If your phone has been wet, power it off when ready and do not charge it. Leave it in a dry place for at least 48 hours. If it powers back on and works normally, the water damage was minor. If it does not power on, or if it powers on but the screen is dark or unresponsive, water has damaged the internal circuits and replacement is necessary.

A visibly swollen battery—where the back of the phone bulges outward or the screen no longer sits flush with the body—is a safety hazard. Stop using the phone when ready and do not charge it. A swollen battery can overheat or catch fire. This is one of the few situations where replacement is urgent rather than optional.

Age and the cost of repair versus replacement

An iPhone typically remains reliable for three to five years. After five years, battery degradation, screen wear, and general hardware fatigue become more common. At that point, the cost of repairing individual components often approaches or exceeds the cost of buying a used or refurbished replacement phone.

Before paying for a repair, compare the cost to the price of a used phone of the same model or a newer model. If your current phone is six years old and the battery replacement costs $70, but a used phone of the same model costs $150 and comes with a fresh battery, the used phone may be the better value. If your phone is only two years old and the battery costs $70, replacement is less practical—the phone still has years of life left.

Check the current market price for your phone model by searching online retailers or used phone marketplaces. This gives you a real number to compare against repair costs.

Software updates and performance

Newer versions of iOS sometimes run slower on older iPhone models because the software is designed for newer hardware. If your phone slows down noticeably after a software update, this does not mean the phone is broken—it means the software is demanding more from older components.

You can check which iOS version your phone is running by opening Settings, tapping General, then About. If your phone is more than four years old and running the latest iOS version, some slowdown is normal and not a reason to replace the phone unless it interferes with your actual use. If the slowdown is severe, you can try deleting unused apps, clearing the cache (Settings > General > iPhone Storage, then tap each large app and select Offload App), or restarting the phone regularly. These steps often improve performance enough to keep the phone usable.

Frequently Asked Questions

How long do iPhones usually last?

Most iPhones remain reliable for three to five years with normal use. After five years, battery degradation and hardware wear become more frequent. Some iPhones last longer, especially if the battery is replaced and the phone is not dropped or exposed to water.

Is it worth replacing the battery instead of buying a new phone?

If your iPhone is two to four years old and the only problem is battery health below 50 percent, battery replacement is usually worth the cost. If the phone is older than five years or has other hardware problems, the cost of multiple repairs may exceed the price of a used replacement phone.

What should I do if my iPhone screen is cracked but still works?

A cracked screen that still responds to touch can be left alone if the crack does not interfere with your use. If the crack is spreading, the screen does not respond in certain areas, or you are concerned about water entering through the crack, screen replacement is practical.

Can I use my iPhone if the battery is swollen?

No. A visibly swollen battery is a safety hazard and can overheat or catch fire. Stop using the phone when ready, do not charge it, and replace it as soon as possible.

Why is my iPhone so slow after the latest update?

Newer iOS versions sometimes run slower on older hardware because the software demands more processing power. Try deleting unused apps, clearing cache, or restarting the phone. If the phone is more than five years old, some slowdown is normal and does not mean the phone needs replacement unless it prevents you from using it.