When to replace a phone, and when to keep it another year

Replace a phone when it has stopped receiving security updates, when apps you depend on will no longer run on it, when a fault makes it unreliable and cannot be economically repaired, or when a needed repair costs more than the same phone sells for used. Keep it in every other case. A tired battery, full storage, a cracked screen and general slowness all feel like end of life and none of them are: each has a fix that costs a fraction of a new device. The signal almost nobody checks is the one that actually sets the expiry date, and it is printed on the manufacturer's support page rather than felt in daily use.

The four reasons that justify a new phone

Security updates have ended. A phone that no longer receives patches keeps working perfectly while quietly accumulating known, published, unfixed holes. This is the only category on the list that gets worse on its own and cannot be repaired at any price.

Software has moved past it. Banking apps, work tools and messaging clients drop support for old system versions, usually a couple of years after the manufacturer stops updating. When an app you need refuses to install or stops syncing, the phone has been retired by the ecosystem regardless of how it feels in your hand.

An unrepairable or uneconomic fault. Water damage that causes intermittent behavior, a failed board, or a repair quote close to the used value of the same model. Corrosion in particular tends to come back.

Your needs genuinely changed. You now rely on it for work photography, or you need dual SIM for travel, or the storage tier you bought is permanently full and cannot be expanded. This is a real reason, as long as it is a need you can describe rather than a feeling that the phone is old.

The support window is the real expiry date

Every phone has a date after which nobody fixes its security flaws. Find yours before you make any decision, because it changes the answer to every other question.

On the Apple side, iPhones typically keep receiving major system versions for around five or more years after release, and get security fixes for a period beyond that. On the Android side the picture varies enormously by price tier. Recent flagship Pixel and Galaxy models promise seven years of system and security updates from launch, which is the longest commitment the industry has made. Mid range and budget Android phones are often supported for two to four years, and the cheapest models sometimes less. The number is published, it is per model, and it is the single most useful thing to look up before buying anything.

Two wrinkles are worth knowing. Android delivers some security components through the app store rather than through a full system update, so parts of the phone keep getting patched after the manufacturer's headline support ends. That is real but partial: it does not cover the kernel or the hardware drivers. And a carrier branded phone sometimes receives updates later than the same model bought unlocked, occasionally much later.

Rules are starting to force the issue. In the EU, regulations that took effect in 2025 require manufacturers to provide security updates for at least five years after a model stops being sold, and to keep spare parts available. In the US there is no federal equivalent, so the manufacturer's published policy is what you have, although a growing number of states have right to repair laws that require makers to sell parts and manuals. This is general information and the details change, so check your own model's support page rather than a rule of thumb. When the window is still open, install what arrives: which updates to install now and which can wait covers the priorities.

Repair or replace, symptom by symptom

The battery row deserves emphasis because it accounts for most of the phones people replace unnecessarily. A worn cell both shortens the day and triggers the performance limits that make a phone feel obsolete, and both effects reverse with a new battery, as what actually wears out a phone battery explains. The storage row is similar: work through what to delete first when storage is full before you conclude you have outgrown the phone.

Reasons that feel urgent but are not

A better camera on paper. Sensor and processing improvements are real, but the gap between a three year old flagship and this year's model in ordinary daylight is small, and most people shoot in automatic mode where the difference is smaller still.

A faster processor. Phone chips have been faster than everyday use requires for years. Unless you play demanding games or edit video on the phone, you will not notice the gain, and you will notice it even less after a week.

The number in the model name. Annual release cycles are a sales calendar, not an engineering one. A phone is not old because a new one exists.

One bad week. New system versions often reindex data in the background for a day or two, which burns battery and makes everything feel sluggish. Give it three days before you draw conclusions.

Buying used or refurbished without getting burned

A phone one or two generations old, with support years remaining, is usually the best value in the category. The risks are specific and checkable.

1. Check the support window for that exact model before anything else. A cheap phone with eighteen months of updates left is not cheap.
2. Get the IMEI before you pay and check it against the carrier blocklists. A blocked IMEI means the phone will never get cellular service, and no repair changes that.
3. Confirm the previous owner's account is removed. Both platforms lock a phone to the original account so a stolen device is useless. If it boots and asks for someone else's login, you own a paperweight. The seller has to complete the process described in wiping a device before selling it, not just delete their apps.
4. Read the battery health figure and any warning that a non genuine part is fitted, which can also mean a lost water resistance seal.
5. Test everything in ten minutes: both cameras, all microphones, the speakers, every button, wireless charging, face or fingerprint unlock, and a plain white screen followed by a plain gray one to reveal burn in or dead pixels.
6. Prefer a seller with a warranty and a returns policy. Refurbished is not a regulated word: read what grade means, what battery threshold is guaranteed, and how long the warranty runs. The general rules in buying from a shop you have never heard of apply in full here.

The same logic transfers to bigger purchases, and the criteria that survive the marketing are laid out in the laptop buying checklist if a computer is next on your list.

The decision in five minutes

Look up your model's end of support date and write it down. If it has passed, or it is under a year away, plan a replacement and stop spending money on repairs. If there are years left, identify the actual complaint: short battery life, no space, or slow. Fix the battery, clear the storage, and give it a week. Whichever way it goes, make a full backup first, because the moment you decide to replace a phone is the moment you discover what was only ever stored on it, and a backup that actually works is what turns a replacement into an afternoon rather than a loss.