A phone charger is one of the few electrical items most of us plug into the mains every single day, often overnight and often in a bedroom. It is also one of the easiest things to buy badly. Online marketplaces, market stalls and petrol-station counters are full of cheap chargers that look almost identical to the real thing, and the differences that matter are hidden inside the plastic case.
Counterfeit chargers matter for two reasons. The mild version is that your phone charges slowly, the charger runs hot, and it fails within weeks. The serious version is that the internal insulation separating mains voltage from the low-voltage side is inadequate, which is exactly the fault that causes shocks and fires. UK safety charity Electrical Safety First has campaigned on counterfeit chargers for years for precisely this reason.
The good news is that you do not need a multimeter or an engineering degree. A handful of sensible checks will filter out almost everything dubious before it reaches your plug socket.
1. Start with where you are buying it
This is the single biggest factor, and it is the one most people skip. Buy from a retailer that stands behind what it sells, rather than an anonymous third-party seller with a jumble of unbranded listings. On large marketplaces, pay attention to who is actually shipping the item, not just the brand name in the title — a genuine brand name in a listing does not guarantee a genuine product in the box.
If a charger is being sold for a fraction of what every other seller charges, treat that as information. Mains-powered electronics have a floor price below which the safety components have to be left out. Everything in our phone charger shop is sold with UK plugs and proper documentation, which is the baseline you should expect anywhere.
2. Look at the plug pins
UK three-pin plugs are built to a standard, BS 1363, and genuine chargers follow it closely. Pick the charger up and look at the pins. The live and neutral pins should have a black insulating sleeve covering the part nearest the body, so that your fingers cannot touch live metal while the plug is partly inserted. Missing or unusually short sleeves are a red flag.
Then try it in a socket. A proper plug goes in firmly and sits flush. If it wobbles, feels loose, needs excessive force, or the pins are visibly uneven, put it aside. Poorly made pins are a genuine hazard as well as a sign of a wider lack of care in manufacturing.
3. Read the markings on the body
Every legitimate mobile phone charger carries printed information on the casing. You should be able to find the manufacturer or brand name, a model number, the input voltage range, the output voltage and current, and safety or conformity marks such as UKCA or CE. There should also be a traceable manufacturer name and address on the charger or its packaging.
Now look at how that text is printed. On a genuine charger it is crisp, evenly spaced and does not rub off. Fakes frequently have blurred or misaligned text, spelling mistakes, mismatched fonts, or markings that smudge under a thumbnail. A charger with no output rating printed anywhere is not worth plugging in at all.
4. Feel the weight and the build
A real charger contains a transformer, capacitors and insulation, and that hardware has mass. Counterfeits are often noticeably light for their size because there is simply less inside. Squeeze the casing gently: it should be rigid, with tight, even seams and no gaps you can see into. Creaking plastic, visible glue or a seam you can prise apart with a fingernail all point the wrong way.
Modern gallium nitride chargers are a fair exception to the weight rule, because the technology genuinely does shrink the components. Those chargers still feel solidly built and carry full markings, so judge them on the other checks rather than mass alone.
5. Watch how it behaves in use
Some problems only show up once a charger is working. Getting warm is normal, particularly during fast charging. Getting genuinely hot to hold, giving off a smell of hot plastic, buzzing, crackling or making your phone feel uncomfortably warm is not. Unplug anything that does those things and stop using it.
Erratic charging is another clue. If your phone repeatedly connects and disconnects, charges far more slowly than it should, or the touchscreen becomes jumpy and unresponsive while plugged in, the charger is likely delivering unstable power. Before blaming the charger outright, rule out the simpler causes in our guide to why your phone will not charge.
6. Do not forget the cable
A safe charger paired with a poor charging cable is still a problem. Thin, unshielded cables with flimsy moulding at the connector are the most common failure point, and a frayed cable exposing bare conductors should be binned immediately rather than taped up. Cables built for fast charging also need to carry the right internal wiring, which is why a good cable is worth buying deliberately rather than grabbing the cheapest one available.
What to do if you already own a suspect charger
Stop using it, unplug it, and do not pass it on to someone else. If you bought it recently, contact the seller for a refund; if you believe it is counterfeit, you can report it to Citizens Advice, which passes reports to Trading Standards in the UK. Then replace it with something you can verify.
For most people that means one decent wall charger at home and a second for the bag, rather than a drawer full of unknown plugs. If you want faster top-ups, our fast chargers cover the common USB-C Power Delivery wattages without you having to guess at the specifications.
The short version
Buy from somewhere accountable, check the pins and the printed markings, be suspicious of anything unusually light or unusually cheap, and pay attention to heat and odd behaviour once it is plugged in. A phone charger is a small purchase, but it is one of the few you leave running unattended in your home — it is worth the thirty seconds of checking.