Buying a UK-used iPhone can be a good way to get an iPhone at a lower price than a new one. However, buying a used phone requires more than checking if the phone looks clean.
A phone may look almost new and still have a weak battery, a replaced screen, a faulty Face ID, or a network restriction. If you do not know what to check, you could end up spending extra money fixing problems that you did not know about.
If you are buying a UK-used iPhone, especially for the first time, here are the important things to check before you pay.
1. Check the IMEI Number
IMEI stands for International Mobile Equipment Identity. It is a unique number used to identify a mobile phone.
To find it on an iPhone, go to Settings > General > About and look for IMEI. You can also dial *#06# to display it.
The important thing is to make sure the IMEI on the phone matches the IMEI information provided by the seller or shown on the device’s documentation.
Do not be afraid to ask questions if something does not match. You are paying for the phone, so you have every right to verify what you are buying.
2. Check Activation Lock
This is one of the most important things to check when buying a used iPhone.
Activation Lock is connected to Apple’s Find My feature. It is designed to prevent someone else from using an iPhone if it has been lost or stolen.
If the previous owner’s Apple Account is still connected to the phone, you may not be able to set it up for yourself.
The safest thing to do is ask the seller to erase the iPhone before you pay. Start the setup process yourself.
If you see a message saying “iPhone Locked to Owner”, or the phone asks for the previous owner’s Apple Account information, stop there.
Do not pay for the phone until the previous owner has properly removed it from their account. Apple also advises buyers not to take ownership of a used iPhone that is protected by Activation Lock.
3. Check Battery Health
The battery is one of the most important things to check on a used iPhone.
As an iPhone is used over time, its battery capacity naturally decreases. This means a used iPhone with a heavily worn battery may not last as long as it did when it was new.
To check it, go to:
Settings > Battery > Battery Health & Charging
Look for Maximum Capacity.
For example, if you see 100%, the battery currently has the same maximum capacity as when it was new. If you see a lower percentage, the battery has experienced some wear.
There is no single percentage that automatically makes a used iPhone good or bad, but the lower the capacity becomes, the more likely you are to notice shorter battery life.
Also check whether the phone recommends a battery service.
4. Check if the Screen Has Been Replaced
A used iPhone may have had its screen replaced before you bought it.
This is not necessarily a reason to reject the phone, but you should know about it because the replacement may affect the phone’s performance or value.
On supported iPhone models, go to:
Settings > General > About
Look for Parts and Service History.
If the phone has repair information available, you may see details about replaced parts such as the display or battery.
Apple may also show whether a part is recognised as genuine. If you see an Unknown Part message, ask the seller about it before paying.
You should also physically test the screen. Open different apps and move your finger across the entire display. Make sure there are no areas where touch does not respond.
5. Test Face ID
If the iPhone has Face ID, do not simply assume that it works.
Go to Settings > Face ID & Passcode and try setting up Face ID.
Once it is set up, lock the phone and try unlocking it with your face several times.
You should also test Face ID in different positions to make sure it is working properly.
If Face ID does not work, ask why. Do not ignore the problem simply because everything else on the phone looks fine.
6. Test the Camera
Open the Camera app and test every camera available on the phone.
Take pictures using the main camera, switch to the ultrawide camera if the model has one, and test the telephoto camera on Pro models.
Also test the front camera.
Take pictures in different lighting conditions and check the results. Look for unusual spots, blurry areas, lines, or anything that does not look normal.
Record a short video too. This allows you to check both the camera and the microphone.
7. Test the Speaker and Microphone
Play music or a video and listen carefully to the speakers.
The sound should be clear without strange buzzing or distortion.
Next, open the Voice Memos app and record yourself speaking. Play the recording back and listen to the quality.
You can also make a test call if possible. This allows you to check the microphone, earpiece, and network connection at the same time.
8. Check the Charging Port
Connect a suitable charger to the phone and make sure it starts charging.
Do not just connect it for a few seconds. Leave it connected for a while and make sure the charging connection remains stable.
Gently move the cable slightly to see whether the connection cuts off easily.
If the phone only charges when the cable is held in a certain position, the charging port or cable may have a problem.
9. Test the Buttons
Test every physical button on the phone.
Press the volume-up and volume-down buttons, the side button, and the mute switch or Action button, depending on the iPhone model.
They should respond normally without getting stuck.
It is a small check, but replacing or repairing a damaged button can cost you extra money after the purchase.
10. Check the SIM and Carrier Lock
This is particularly important when buying an imported iPhone.
Go to:
Settings > General > About
Look for Carrier Lock.
If it says “No SIM restrictions”, the phone is not locked to a particular network.
If it shows that the phone is locked to a carrier, ask the seller about it before paying. A carrier-locked phone may not work normally with the Nigerian network you intend to use.
You should also insert your SIM and make a test call or check that mobile data works.
11. Inspect the Body Carefully
Now look at the physical condition of the phone.
Remove the case if there is one and inspect the screen, frame, back glass, and camera lenses.
Small scratches are normal for a used phone. What you should pay more attention to are cracks, deep dents, damaged camera lenses, a lifted screen, or signs of serious damage.
Also check whether the screen sits properly on the frame. If there is an unusual gap between the screen and body, ask the seller about it.
12. Check the Storage
Go to:
Settings > General > iPhone Storage
This shows how much storage the phone has and how much is currently being used.
Make sure the storage capacity matches what the seller advertised.
For example, if you are paying for a 256GB model, confirm that the phone is actually the 256GB version.
Storage cannot normally be upgraded later, so it is important to get the capacity you actually need.
13. Check the Phone’s Overall Condition
Finally, put everything together.
A phone can have a good battery but a damaged screen. Another can have a clean body but a replaced camera. Another may look perfect but still be connected to the previous owner’s account.
This is why you should not judge a UK-used iPhone by its appearance alone.
Take your time and test the phone properly. If possible, use a reliable seller who gives you some form of warranty or return period.
Before You Pay
Before handing over your money, make sure you have checked the IMEI, Activation Lock, battery health, parts and service history, Face ID, cameras, speakers, microphone, charging port, buttons, SIM/network connection, carrier lock, storage, and physical condition.
Most importantly, do not allow a seller to rush you because another buyer is supposedly waiting. You are the one spending the money, so you should be allowed to inspect the phone properly.
A UK-used iPhone can be a good purchase, but the fact that it is called “UK-used” does not tell you everything about its condition. Check the actual phone, understand what you are checking, and only pay when you are satisfied with what you have found.
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