A used smartphone can give you a flagship experience for a fraction of the new price, but only if you know what you're buying. The difference between a bargain and a costly mistake usually comes down to a handful of quick checks. Learn what they are, and you can shop second-hand with complete confidence.
Here's exactly what to look for before you part with your money, whether you're buying from a marketplace, a private seller or a specialist refurbisher.
1. Inspect the physical condition
Start with a careful visual once-over. Cosmetic wear is normal on a used device, but certain flaws can signal deeper problems, or a phone that's been dropped one too many times.
- Screen: check for cracks, dead pixels, discolouration and touch response across the whole display.
- Body and frame: look for dents or bends, which can hint at internal damage or a poor past repair.
- Ports and buttons: test the charging port, volume keys and power button, and make sure nothing is loose or sticky.
- Water damage: ask whether the device has ever been exposed to liquid, as this often causes faults months later.
If you're buying online rather than in person, ask for clear, well-lit photos from multiple angles and a description of the exact condition grade.
2. Check the battery health
Battery is the single most common weak point on an older phone, and a tired one means shorter runtime and possibly an early replacement bill. The good news is that it's easy to check.
On an iPhone
Go to Settings > Battery > Battery Health & Charging and look at Maximum Capacity. Anything at 85% or above is healthy; below around 80% and you should factor in a replacement.
On an Android phone
Battery health isn't always shown natively, but many handsets display it under Settings > Battery or via the built-in diagnostics menu. Failing that, a reputable seller should be able to tell you the tested figure.
3. Confirm storage and performance
Storage can't usually be upgraded after purchase, so make sure the capacity suits how you actually use your phone. Photos, apps and offline video eat space quickly, and a phone that's constantly full will feel sluggish.
- Check the total and available storage under Settings > Storage.
- Open a few apps to confirm the phone runs smoothly without lag or unexpected restarts.
- Where possible, choose 128GB or more if you take a lot of photos or install large apps.
4. Verify network compatibility and unlock status
A phone that's locked to a network you don't use is far less convenient, and harder to resell later. Before buying, confirm two things.
- Carrier lock: ask whether the device is unlocked or tied to a specific network. An unlocked phone works with any SIM.
- Band compatibility: check the model supports the bands your provider uses, especially for 5G. Handsets from other regions occasionally lack the right bands for UK networks.
If in doubt, a quick call to your network provider with the model name will confirm whether it will work on their service.
5. Check the IMEI, blacklist and account locks
This is the step most people skip, and the one that matters most. It confirms the phone is genuine, hasn't been reported lost or stolen, and isn't tied to someone else's account.
Find and check the IMEI
Dial *#06# on any phone to display its IMEI number, or find it in Settings > General > About. Run that number through a reputable IMEI checker to confirm the device isn't blacklisted (reported lost, stolen or blocked by a network). A blacklisted phone may stop working on UK networks entirely.
Make sure it's not account-locked
Activation locks stop a phone from being used until the previous owner's account is removed. Always confirm the device is fully signed out before you buy.
- iPhone: the seller must sign out of iCloud and turn off Find My iPhone. If Activation Lock is still on, the phone is effectively unusable.
- Android: the previous owner should remove their Google account and perform a factory reset to clear any Factory Reset Protection lock.
Don't forget the seller and the warranty
Even with every check above, who you buy from matters. A private sale usually means no returns and no comeback if something goes wrong days later. Buying from an established retailer gives you real protection.
- Look for a clear returns policy so you can test the phone risk-free.
- Choose a seller that offers a proper warranty, not just a few days' goodwill.
- Check reviews and confirm the business is contactable if you need support.
Buy with confidence at Sell Phone Store
Doing these checks yourself is smart, but you shouldn't have to become an expert to buy a used phone safely. At Sell Phone Store, every device is fully tested and graded before it's listed, comes with a 12-month warranty, and is covered by 30-day free returns, so the risks above are handled for you.
Ready to find your next phone? Browse our full range at our collections, or head straight to the latest refurbished iPhones.
Buying a used smartphone is a great way to save money, but it’s important to make sure the device is in good condition before making a purchase.
Here are five important things you should check before buying a used phone.
1. Physical Condition
Inspect the phone carefully for scratches, cracks, or dents. A damaged screen or body could indicate deeper problems with the device.
2. Battery Health
Battery life is one of the most important aspects of a smartphone. If the battery drains quickly, it may need replacement soon.
3. Storage Capacity
Make sure the device has enough storage for your needs. Smartphones with larger storage capacities are usually more valuable and convenient.
4. Network Compatibility
Always check whether the phone is compatible with your carrier or network provider. Some devices may be locked to specific networks.
5. Device Authenticity
Ensure the phone is genuine and not reported as lost or stolen. Checking the IMEI number can help confirm the device’s status.
Buying from a trusted platform like SellPhoneStore.com helps reduce these risks and ensures customers receive quality smartphones.
