Yes, modern smartphones contain several magnets. Some are tiny permanent magnets built into components like speakers and cameras, while others, like the ring of magnets used for wireless charging in newer iPhones and Android phones, are surprisingly strong. Beyond these physical magnets, your phone also has a magnetic sensor that detects Earth’s magnetic field to power your compass and navigation apps.
Where the Magnets Are
A typical smartphone has magnets in at least three or four places, and sometimes more. The speaker is the most universal example: every phone speaker uses a small permanent magnet to convert electrical signals into sound waves. Phones with multiple speakers have multiple magnets. The camera module also contains magnets, which help with autofocus and optical image stabilization by making tiny, precise adjustments to the lens position.
The vibration motor (often called a haptic engine or Taptic Engine) is another magnet-dependent component. When your phone buzzes for a notification or gives you that subtle click feeling when you adjust a slider, a small permanent magnet is being pushed and pulled by an electromagnet to create that physical sensation. These magnets are compact, often less than 8 millimeters across, but produce meaningful magnetic fields.
If your phone supports MagSafe or the newer Qi2 wireless charging standard, it has the most magnets of all: a ring of trapezoidal permanent magnets arranged in a circle beneath the back glass. This ring snaps your phone onto compatible chargers, wallets, and mounts. It also generates the strongest magnetic field of any component in the phone.
How Strong Are These Magnets?
Researchers at the University of Utah mapped the magnetic fields radiating from iPhones in three dimensions and found that the magnet ring on the back of an iPhone 13 Pro produced a field of about 68.8 millitesla (mT) right at the surface. That drops off sharply with distance: at just 4.4 millimeters away, the field had already fallen to 8.9 mT.
Other components produce notable fields too. The top speaker on an iPhone 12 measured 35.5 mT on the front side of the phone, and the wide-angle camera on the iPhone 13 Pro measured 17.0 mT. These numbers matter because the international safety standard for implanted medical devices sets a limit of 1 mT, a threshold that several phone components exceed at close range.
For context, a refrigerator magnet produces roughly 5 mT at its surface. So the MagSafe ring is more than ten times stronger than a fridge magnet when measured right against the phone’s back, though its field weakens rapidly as you move away.
The Magnetic Sensor Inside Your Phone
Separate from the physical magnets, your phone contains a magnetometer: a sensor that detects magnetic fields in the environment. This is what powers your compass app and helps maps rotate in the right direction as you turn.
The sensor itself is a Hall effect chip just a few millimeters in size. It measures voltage changes caused by surrounding magnetic fields. Your phone actually has three of these sensors oriented along different axes, which together can calculate the full direction and strength of Earth’s magnetic field. That data tells the phone exactly how it’s oriented in space, which is why your navigation arrow points the right way even when GPS alone can’t determine which direction you’re facing.
This same type of sensor serves another purpose. Many phones and tablets use a Hall effect sensor near the edge of the device to detect when a magnetic flip cover is closed. A small magnet in the cover triggers the sensor, telling the phone to turn its screen off automatically.
Can Phone Magnets Damage Cards or Devices?
The magnets in a phone’s speaker and camera are generally too weak to demagnetize modern credit or debit cards. These cards use high-coercivity magnetic stripes that resist casual exposure to weak fields. Chip-based cards, which account for most credit and debit cards today, store data electronically rather than magnetically, so a phone magnet can’t wipe them at all.
Hotel key cards and parking garage cards are a different story. These use low-coercivity magnetic stripes that are much easier to scramble. Keeping a hotel key card in the same pocket as your phone, or tucking it into a phone case, can and frequently does erase it. Wireless charging creates an even stronger magnetic field, so placing any magnetic stripe card between your phone and a charging pad is a reliable way to kill the card.
Phone Magnets and Medical Implants
People with pacemakers or implanted defibrillators have genuine reason to be careful. These devices have a built-in “magnet mode” that can be triggered by external magnetic fields, potentially changing how the device paces or monitors the heart. Since multiple smartphone components exceed the 1 mT safety threshold defined by international standards, the FDA recommends keeping smartphones at least six inches (about 15 centimeters) away from an implanted cardiac device. At that distance, the risk of interference becomes extremely unlikely. In practice, this means avoiding placing your phone in a breast pocket directly over the implant or resting it on your chest while lying down.
Why Phones Keep Adding More Magnets
The trend is toward more magnets, not fewer. The Qi2 wireless charging standard, developed by the Wireless Power Consortium, now requires a magnetic alignment ring for its top power profile. This means Android phones adopting Qi2 are adding MagSafe-style magnet arrays that were previously exclusive to iPhones. The standard defines specific requirements for magnetic field strength, polarity, and positioning so that chargers and accessories work reliably across brands.
For phones that don’t have built-in magnets for charging, the Qi2 specification allows for magnets embedded in compatible phone cases instead. This lets older phones access magnetic charging accessories without a hardware upgrade, while keeping the magnet ecosystem expanding across the industry.