Before replacing a phone, name the task it cannot do. “It is old” is a description. “It switches off before my journey home” is a problem you can investigate.
A working phone is not automatically suitable forever. Reliability, security, accessibility and changing needs can justify replacing it. The point is to diagnose the limit before paying to replace the entire device.
Check support and the actual fault
Start with the model and installed software. Apple's security-release list identifies releases and supported devices; consult the entries relevant to your model rather than assuming age alone proves support has ended. A current operating-system version and an older version receiving a particular security update are not necessarily the same support situation.
For battery problems, Apple's troubleshooting guidance explains where to review usage and battery health, including when service may be appropriate. Do not assume every short day of battery life proves the battery needs replacing: usage and background activity may be involved.
Record storage, physical damage, app compatibility and the task that fails. A bank or employer app may have requirements beyond the phone's basic ability to switch on. Check those with the relevant provider.
Compare one more year on a consistent basis
Illustrative decision: the current phone could sell for £180 today. A new phone costs £800 and might be worth £450 in a year. A repair costs £90; keeping the repaired phone for that year might leave a £100 resale value. All prices and future values are assumptions, not Apple quotes or guaranteed valuations.
Keeping costs £180 of opening device value + £90 repair − £100 closing value = £170 for the year. Replacing costs £800 − £450 = £350. The expected ownership-cost difference is £180, while today's cash difference is much larger: £90 repair versus £620 after selling the old phone.
The calculation assumes both options serve the need for a full year. A failed repair or ending support can change the answer. Get a diagnosis, repair terms and a backup plan rather than assigning certainty to the cheaper column.
Separate a useful feature from a new label
Write the improvement as an activity: a camera capability used for work, an accessibility feature, or reliable navigation through a full shift. “Pro”, “new generation” and a benchmark score do not explain that personal benefit on their own.
The same test applies to laptops and tablets. A faster export can matter to someone regularly delivering paid video work; it need not matter equally to someone whose email already works. This is an assessment of use, not an assertion about a manufacturer's private intentions.
If storage is the issue, compare safe cleanup or additional storage costs over the intended period. Back up important information before removing anything. Do not pay for a storage subscription indefinitely without including it in the keep-versus-replace calculation.
Decide what happens to the old device
A trade-in uses an asset you already own. A quoted credit is not a gift, and a conditional valuation may change after inspection. Selling, passing on or retaining one genuinely needed backup each has a different value. Apple's transfer checklist covers preparing a device before sale or handover.
For a longer replacement-cycle comparison, use the six-year ownership example. That addresses purchase frequency; this guide addresses the phone in your hand today.
You may still choose the new model for enjoyment. It is easier to make that choice honestly once you know whether you are buying a solution, a feature you value or simply a new phone you would like.
