Ask when a phone dies and you’ll get an answer about hardware failure. In practice, almost nobody’s phone stops working. It expires.
Four separate clocks run on every device, and whichever finishes first ends the phone’s useful life. Understanding which one you’ll hit is the difference between buying a five-year phone and buying a two-year one at the same price.
The four clocks
The software clock. Security updates stop. The phone keeps working and gradually becomes a worse place to keep anything sensitive. Apps eventually start requiring an OS version it can’t run.
The battery clock. Capacity degrades with cycles and heat. Unlike the others, this one is resettable — a replacement restarts it — but only while parts remain available.
The parts clock. Manufacturers stop supplying service components after a period. Apple’s published policy classifies products as vintage around five years after distribution ends and obsolete around seven; other manufacturers operate similar windows less publicly. After that, repairs depend on salvage and aftermarket supply.
The relevance clock. The phone still works and simply can’t do what you now need — an app that demands more memory, a camera that’s fallen behind, a network standard it doesn’t support.
For most people the software clock finishes first, which is why it deserves more weight in a buying decision than hardware specifications do.
Realistic lifespans by brand
Measured from original launch, assuming a battery replacement along the way.
| Brand / line | Software support | Realistic total life | Limiting factor |
|---|---|---|---|
| Pixel 8 and later | 7 years from launch | 7 years | Battery and parts, if you keep it that long |
| Galaxy S24 and later | 7 years from launch | 7 years | Battery and parts |
| iPhone (recent generations) | No published policy; historically ~5–6 years of major releases | 5–7 years | Software, then parts |
| Galaxy S23 and earlier flagships | 4 OS upgrades, 5 years security | ~5 years | Software |
| Pixel 6 and 7 | 5 years security | ~5 years | Software |
| Mid-range from major brands | Typically shorter, varies by model | 3–4 years | Software, clearly |
| Budget and lesser-known brands | Often 2 years or less | 2–3 years | Software, sometimes parts |
The striking row is the last one. A cheap phone isn’t cheap if it expires in two years, and this is the calculation that reorders most shortlists when people actually run it.
The other thing worth noticing: the top rows are limited by hardware rather than software, which is a genuinely new situation. Seven-year support commitments mean the battery and parts clocks now finish first on the best-supported devices, which is the reverse of how phones worked for the previous decade.
What this means when buying used
The number that matters isn’t age. It’s years of support remaining, and it’s easy to calculate: launch year, plus the manufacturer’s commitment, minus the current year.
A three-year-old Pixel 8 with four years remaining is a longer-lived purchase than a one-year-old budget phone with one year left, and it will usually cost less. Divide asking price by years remaining and compare across your options — our upper-mid tier buying guide works through that arithmetic with specific models.
Two adjustments to apply on top.
Subtract for a tired battery unless you plan to replace it. Health under 80% means the phone needs a service to reach its potential lifespan.
Subtract for aftermarket parts. A phone with a copy screen has a higher chance of a repair failing during the period you own it, and less value at the end of it.
The battery clock, specifically
The one you can reset, and the one people misjudge.
Manufacturers rate batteries by cycles rather than years. Apple’s older iPhone batteries were specified to retain 80% of capacity at 500 complete charge cycles; the iPhone 15 generation and later are rated to 80% at 1,000 cycles, roughly doubling that figure. Android manufacturers publish similar specifications less consistently.
A complete cycle is a full charge’s worth of use, not a plug-in — charging from 60% to 100% twice is one cycle. Typical daily use puts most people somewhere between 250 and 400 cycles a year.
Heat matters as much as cycles. Charging in a hot car, gaming while plugged in, or leaving a phone on a sunny windowsill ages a battery faster than the cycle count suggests. Keeping the phone roughly between 20% and 80% for daily use is gentler than running it flat and filling it every day, and most recent phones automate this.
Our battery health guide covers how to read the numbers on a phone you’re considering.
Why the relevance clock matters less than it used to
Worth a moment, because it changes how long a used phone is worth keeping.
A decade ago, a four-year-old phone struggled with current apps. Processors were improving fast enough that software assumed hardware you didn’t have, and the phone became genuinely slow rather than merely older.
That gap has narrowed considerably. A flagship from three or four years ago runs current apps comfortably, shoots good photographs, and handles everything most people do daily. The improvements between generations are now incremental enough that the relevance clock rarely finishes first.
Which is precisely why software support became the binding constraint, and why manufacturers extending their commitments to seven years mattered so much. When the hardware stays capable, the update policy decides how long you can safely use it — and that’s a decision made by the manufacturer at launch, years before you buy the phone used.
The practical upshot for a used buyer: worry less about whether a three-year-old phone will feel slow, and more about when its patches stop.
What actually fails on hardware
When phones do break rather than expire, it’s a short list, and it’s consistent.
Batteries, by a wide margin, and it’s the one repair that’s almost always worth doing.
Charging ports, from wear, lint, and the mechanical stress of daily plugging. Often the cheapest common repair.
Screens, from drops.
Rear cameras, usually cracked lens glass rather than sensor failure.
Speakers and microphones, frequently from liquid exposure rather than age.
Logic board failures are rare on phones that haven’t been dropped hard or gotten wet. Which is the underlying point: most phones don’t wear out. They get damaged, or they run out of software.
Making a used phone last longer
Practical, in rough order of effect.
Replace the battery once, at around the three-year mark. The single highest-impact thing you can do, and it resets the clock most likely to end your enjoyment of the phone.
Use a case and a screen protector. Boring, effective. The two most common hardware failures are both impact-related.
Keep it out of heat. No hot cars, no charging under pillows, no gaming while plugged in if you can avoid it.
Clear the charging port occasionally. A wooden toothpick and a light. Prevents the second most common repair.
Keep it dry, and take the IP rating less seriously than the marketing suggests — our water damage guide explains why an aging seal isn’t what it was.
Install updates. They’re the resource you bought when you chose the phone.
Signs a phone is nearing the end
Recognisable, and worth knowing before you spend money on one.
Updates have stopped arriving, or the manufacturer’s published support date has passed. The clearest signal there is.
Apps have started refusing to install or warning that the OS version isn’t supported.
Battery health is low and parts are scarce for that model, so the one repair that would help isn’t practical.
More than one fault at once. Multiple simultaneous issues on an old device usually indicate general wear rather than coincidence.
Charging has become unreliable in more than one way — slow, intermittent, and hot. That combination often points to the battery and the port together.
It can’t do a thing you now need — a network standard, an app, a camera capability. This is the relevance clock finishing, and no repair addresses it.
One or two of these on a phone with support remaining is a repair conversation. Three or more, or any of them on a phone out of support, and you’re maintaining something rather than owning it.
How long do accessories last
Briefly, since they age on different schedules and people assume otherwise.
Cables and wired chargers: years, essentially indefinitely, until physical damage ends them. Buying these used is fine.
Power banks: the cells degrade like any battery, so real capacity falls well below the printed figure after a few hundred cycles. A swollen casing is a hazard, not a cosmetic issue.
True wireless earbuds: the shortest life of anything in this list. Tiny non-replaceable cells lose runtime faster than phone batteries, and most pairs are noticeably worse by year three.
Cases and screen protectors: as long as you like, cosmetics aside.
The practical implication when buying used: wired accessories are safe purchases, battery-containing accessories are not.
Veelvoorkomende fouten om te vermijden
- Judging a phone by its age instead of its support runway. Two very different numbers.
- Buying a cheap phone with a short support window. The cheapest phone per year is frequently not the cheapest phone.
- Refusing a battery replacement on an otherwise sound device. Resets the clock most likely to be limiting you.
- Assuming a phone is finished when it slows down. It’s usually the battery, and that’s fixable.
- Ignoring parts availability on older models. A repairable phone stops being repairable at some point.
- Treating IP ratings as permanent. They degrade with age and end with most repairs.
Veelgestelde vragen
How many years should a used phone last?
Take its launch year, add the manufacturer’s support commitment, and subtract the current year. On recent Pixel and Galaxy flagships that’s up to seven years from launch; on budget phones it can be two.
Do iPhones last longer than Android phones?
Historically yes, because of longer software support. Recent Pixel and Galaxy flagships now match or exceed typical iPhone support windows, so the answer depends on which Android phone rather than on the platform.
Is it worth buying a phone with two years of updates left?
Only at a price that assumes you’ll replace it in two years. Divide the asking price by the years remaining and compare — that figure reorders most shortlists.
How many charge cycles does a phone battery last?
Older iPhone batteries were specified to retain 80% capacity at 500 cycles; the iPhone 15 generation and later are rated at 1,000. A cycle is a full charge’s worth of use, not a single plug-in.
Can I keep using a phone after updates stop?
It’ll keep working. It stops receiving security patches, and over time some apps will stop supporting it. For a secondary or Wi-Fi-only device that’s often acceptable; for a primary phone with banking apps on it, less so.
Does a phone slow down as it ages?
Not usually because of age itself. Perceived slowdown is most often a degraded battery causing the system to limit peak performance, or newer software demanding more than the hardware comfortably provides. The first is fixable with a battery service; the second isn’t.
Do phones last longer if I avoid fast charging?
Heat matters more than speed. Fast charging generates heat, so charging in a cool place and avoiding heavy use while plugged in does more good than avoiding fast charging altogether.
What’s the most valuable thing I can do to extend a phone’s life?
Replace the battery once, around the three-year mark, through an authorised service.
Look up the support end date for the phone you own right now. Most people have never checked, and the answer usually decides whether the next repair is worth paying for.
If it’s time to move on, see what’s currently listed on ExploreFrag and shop by years remaining rather than by age.
About the author
Emran Ahmed is the founder and CEO of ExploreFrag, a marketplace for buying and selling used phones and accessories across every brand. He got interested in the four-clocks framing after noticing how few phones arriving on the marketplace were actually broken. He reviews listings most days and now asks about support runway before he asks about condition.