Wireless charging on a mobile phone works by transferring power from a charging pad or stand to your phone through a short-range magnetic field, without needing to plug in a cable. This process, called inductive charging, uses a transmitter coil in the charger and a receiver coil in your phone to create an electromagnetic field that generates an electrical current, which is then converted to direct current to charge the battery.
What is wireless charging and how does wireless charging work?
Wireless charging, also known as inductive charging, is the process of transferring power from a power outlet to your smartphone without a physical cable connection. The charger acts as a transmitter, and your phone acts as a receiver. When you place your phone on a wireless charging pad, an electrical charge passes through two coils, one in the pad and one in your phone, to produce an electromagnetic field. The receiving coil in your phone converts that magnetic field into an electrical current, which is then transformed into direct current to charge your phone’s built-in battery. Wireless charging can be traced back to Nikola Tesla's late-1800s experiments with resonant inductive coupling, wirelessly lighting lamps in New York City.
Do I need a special wireless charging phone?
Yes, your phone must have built-in wireless charging hardware for wireless charging to work. Apple documents support for iPhone 8 or later. Google documents support for Pixel 3 and later, with the exceptions of Pixel 3a, Pixel 4a, Pixel 4a (5G), Pixel 5a, and Pixel 6a. Samsung documents that Galaxy A series, XCover series, and Galaxy Tab series devices are not compatible with wireless charging. If your phone does not have built-in support, no official support page from Apple, Google, or Samsung documents using a replacement rear case or cover to add it.
Step-by-step: How to wirelessly charge your phone
- Connect the wireless charger to power using the adapter that came with it or one recommended by the manufacturer.
- Place the charger on a level surface or another manufacturer-recommended location.
- Place your phone on the charger with the display facing up, centered on the charger or in the manufacturer-recommended location for best performance.
- Wait a few seconds for the charging icon to appear in the status bar, confirming proper alignment and that charging has started.
What is the Qi wireless charging standard?
Qi is the universal wireless charging standard developed by the Wireless Power Consortium. It is used by major smartphone manufacturers including Apple, Samsung, and Google, ensuring compatibility across different brands of phones and chargers. Apple explicitly names Qi-certified chargers for iPhone, and Google’s Pixel help also refers to Qi-certified chargers for Pixel Stand compatibility. Qi has become the dominant standard for wireless charging in the digital era. Qi standard has three distinct power specs starting at 5W minimum, with some smartphones compatible with 7.5W, 10W, 15W, and up to 30W in newer variants. A lesser-known wireless charging standard is Powermat, which eventually joined forces with WPC to expand Qi. Individual companies like Samsung have developed their own wireless charging technologies for ultra-fast wireless charging capacities.
What do I need for wireless charging?
You need two essential items: a Qi-certified wireless charger and a compatible power adapter for that charger. No special phone settings are required to be turned on for standard wireless charging. Apple documents that you simply need a Qi-certified charger connected to power, then place your iPhone on it face up and centered. Google says wireless charging is available only on supported Pixel models, and its Pixel Stand can charge Qi-certified phones. For phones without built-in wireless charging, a specific third-party accessory option is a wireless charging case integrated with a receiver. For older flagship/premium predecessors (e.g., iPhone 7, Samsung Galaxy A71, Google Pixel 2/2 XL), a specific third-party accessory option is a wireless charging-compatible replacement rear case/cover combined with a wireless charging pad. For old phone models, a specific third-party accessory option is a universal adapter combined with a wireless charging pad. A cost-saving tip: purchase bigger wireless charging pads to charge multiple devices at once if all your devices support wireless charging. Wireless charging accessories range from $30 to $120 for a quality pad, depending on brand, size, and model.
Pros and cons of wireless charging
The key benefit of wireless charging is convenience: you simply place your phone on the charger without dealing with cables, and it works with Qi-certified chargers found in cars, cafes, hotels, airports, and furniture. A 'one size fits all' solution benefit: you can charge multiple wireless-enabled devices all at once on a single pad. It also reduces wear on your phone’s charging port. The main drawback is slower charging speeds compared to wired fast charging. Apple documents that many Qi-certified chargers charge iPhone at rates up to 7.5 watts, which is slower than some wired methods. However, MagSafe charging can reach higher wireless rates on supported iPhone models with the required adapter, including up to 50% in around 30 minutes on iPhone 18 Pro and iPhone 18 Pro Max with a MagSafe Charger and a 35W or higher adapter. Wireless charging is not compatible with metal-backed phones; most wireless charging phones have glass or plastic rears, making glass-backed ones more delicate.
Frequently Asked Questions
Can I use my phone while it is wirelessly charging?
No, once you lift your phone away from the charging pad, it stops charging. You cannot use your phone while it is resting on the pad.
Does wireless charging work through a phone case?
It depends on your phone and charger. Thick cases or cases with metal components may cause intermittent charging or prevent it from working altogether.
Is wireless charging safe for my phone battery?
Yes, wireless charging is designed to be safe. Qi-certified chargers and phones include safeguards to prevent overheating and overcharging.
How do I know if my phone is Qi-enabled?
Check your phone’s specifications from the manufacturer. Apple iPhone 8 or later, Google Pixel 3 or later (with the listed exceptions), and many Samsung Galaxy S and Note series models support Qi wireless charging.
For a complete phone wireless charging setup, you only need a Qi-certified charger and a power adapter. To find out if your phone works, check it & is your phone qi-enabled by looking up your model’s specifications or consulting the manufacturer’s support page.
For the wider topic, see phone wireless charging setup.
