Wireless charging uses a magnetic coil in your phone to pull power from a charging pad — no cable required
Wireless charging works by transmitting electrical energy through the air using electromagnetic induction. Your phone contains a small coil of wire inside it. When you place your phone on a wireless charger, that charger also has a coil. The two coils line up, and the charger's coil creates a magnetic field that causes electricity to flow into your phone's coil, charging the battery. The phone and charger never touch, but the energy transfer happens through the small gap between them.
The most common wireless charging standard is called Qi (pronounced "chee"). Most modern phones that support wireless charging use Qi, including iPhones from iPhone 8 onward and most Android phones made in the last five years. If your phone supports wireless charging, it will say so in the specifications or manual — you can also check the manufacturer's website by searching your phone model and "wireless charging".
Wireless charging is slower than wired charging. A typical wireless charger delivers 5 to 15 watts of power, while a wired charger often delivers 18 to 65 watts. This means a full charge via wireless can take 2 to 4 hours, compared to 30 minutes to 2 hours with a cable. The tradeoff is convenience: you set the phone down and walk away, without plugging anything in.
Key Takeaways
- Your phone must have wireless charging built in — you cannot add it to a phone that does not have the coil inside.
- A Qi-certified charger works with any Qi-compatible phone, so you do not need a charger made by your phone's manufacturer.
- Wireless chargers come as pads, stands, and car mounts, and you can use whichever form fits your space and habits.
- Metal objects, thick cases, and magnetic attachments can block or slow wireless charging, so remove them if charging stops working.
Check whether your phone has wireless charging built in
Not every phone supports wireless charging. To learn about yours does, look up your phone model on the manufacturer's website — search "[your phone model] wireless charging" and check the specifications section. For iPhones, any model from iPhone 8 and newer supports it. For Android phones, most flagship models from Samsung, Google Pixel, and OnePlus made in the last three to four years have it, but budget models often do not.
If your phone does not have wireless charging, you cannot add it without opening the phone and installing a coil yourself — a repair that voids your warranty and is not practical for most people. Your only option is to continue using a wired charger or to replace the phone with one that has wireless charging built in.
Buy a Qi-certified wireless charger
Any charger with the Qi certification mark will work with any Qi-compatible phone. You do not need to buy a charger made by your phone's manufacturer — a Samsung charger works with an iPhone, a Google charger works with a OnePlus phone, and so on. Look for the Qi logo on the product packaging or description. Certified chargers are sold at electronics retailers, big-box stores, and online marketplaces under brand names like Anker, Belkin, Samsung, and Apple.
Wireless chargers come in three main forms. A pad is flat and sits on a desk or nightstand — you place your phone face-up or face-down on top. A stand holds your phone upright at an angle, so you can see the screen while it charges. A car mount attaches to your dashboard or air vent and charges while you drive. All three types work the same way; choose based on where you will use it most.
Prices range from $15 to $50 for a basic single-phone charger. Multi-device chargers that charge a phone and a smartwatch or earbuds at the same time cost $30 to $80. Faster chargers that deliver 15 watts instead of 5 to 10 watts cost slightly more but cut charging time by 20 to 30 percent.
Position your phone correctly on the charger
Wireless charging only works when the coils in your phone and charger are close and aligned. Most chargers have a small circle or dot printed on the surface showing where to place your phone. Line up the back of your phone with that spot. If your charger has no marking, place your phone in the center of the pad or stand.
The phone does not have to be perfectly centered — wireless chargers have a range of a few inches — but if charging does not start within a few seconds, try moving the phone slightly. Some chargers beep or light up to confirm charging has begun; others are silent. Check your phone's battery icon to confirm it is charging.
Remove cases, metal objects, and magnetic attachments if charging stops
Thick phone cases, metal phone rings, and magnetic car mounts can block or weaken the magnetic field between the charger and your phone. If your phone was charging fine and suddenly stops, remove the case and try again. Most thin plastic cases do not interfere, but cases thicker than 3 millimeters may. Leather cases, rubber cases, and fabric cases are usually fine; metal cases and cases with metal reinforcement can block charging entirely.
Magnetic attachments — like those used for car mounts or pop sockets with metal bases — can also interfere. If you use a magnetic car mount, remove the metal plate from the back of your phone before placing it on a wireless charger. Some newer phones have magnets built in for MagSafe accessories; these are designed to work with wireless chargers, but very thick MagSafe cases can still cause problems.
If removing the case does not fix it, the charger itself may be faulty. Try the phone on a different charger, or try a different phone on the same charger. If the charger does not work with any phone, it may need to be replaced.
Understand the limits of wireless charging
Wireless charging generates more heat than wired charging because energy is lost as the magnetic field transfers power. Your phone may feel warm during wireless charging, especially during the final stages when the battery is nearly full. This is normal. However, if the phone becomes too hot to hold, stop charging and let it cool down — excessive heat can damage the battery over time.
Wireless chargers work best when your phone is not in use. Charging slows down significantly if you are using the phone while it sits on the charger, because the processor and screen draw power faster than the charger can deliver it. If you need to use your phone, unplug it and use it normally, then return it to the charger when you are done.
Most wireless chargers do not charge through metal objects, water, or very thick materials. If you want to charge through a desk or table, the surface must be made of wood, plastic, or glass — not metal. Waterproof cases designed for swimming will block wireless charging, though water-resistant cases usually do not.
Frequently Asked Questions
Can I use any wireless charger with any phone?
Any Qi-certified charger works with any Qi-compatible phone, regardless of brand. The Qi standard ensures compatibility. However, your phone must have wireless charging built in — you cannot use a wireless charger with a phone that does not have the internal coil.
Is wireless charging bad for my battery?
Wireless charging is slightly harder on your battery than wired charging because it generates more heat, but the difference is small. If you charge wirelessly every day, your battery may degrade slightly faster than if you used a wired charger, but most phones last three to four years before battery degradation becomes noticeable. Use wireless charging if the convenience is worth it to you.
Why is my phone not charging on the wireless charger?
First, check that your phone supports wireless charging by looking up your model online. Then remove any thick case, metal ring, or magnetic attachment and try again. If it still does not work, try a different phone on the same charger to see if the charger is broken, or try your phone on a different charger to see if your phone has a problem.
How long does wireless charging take?
A full charge via wireless charger typically takes two to four hours, depending on the charger's wattage and your phone's battery size. Faster 15-watt chargers are quicker than standard 5 to 10-watt chargers. Charging slows down in the final 20 percent to protect the battery.
Can I charge my phone overnight on a wireless charger?
Yes, it is safe to leave your phone on a wireless charger overnight. Most modern phones and chargers have built-in protections that stop charging once the battery reaches 100 percent, so the battery will not overcharge. However, leaving the phone on the charger continuously may cause the battery to degrade slightly faster over months or years.