Phone Buzzing or Hissing While Charging? The 4-Test Noise Map
A buzz or hiss that only appears while your phone charges comes from one of three places: the charger itself, the charging pad’s fan, or your phone’s speaker picking up interference. The charger’s high-pitched whine is usually harmless, while a hiss that comes out of the phone’s speaker points to the phone. Four quick tests, done in order, tell you which one you have before you spend money on anything.
The 4-Test Noise Map
You need your phone, its charger and cable, and a quiet room.
- Unplug test. With the noise running, unplug the cable. If the noise stops at once, it is tied to charging. If it keeps going, it isn’t a charging noise at all, so see phone speaker crackling or distorted sound instead.
- Adapter-alone test. Unplug the cable from the phone and leave the adapter in the wall. Listen from a few centimeters away, without touching the metal prongs and without opening anything. If you hear the whine from the adapter by itself, the charger is the source.
- Cover test. Plug the phone back in. Rest a fingertip lightly over the bottom speaker grille, without pressing hard or poking anything into it. If the sound changes or stops, it is coming through the speaker. On a MacRumors thread about a hiss during charging, the original poster found exactly that: the sound came from the left speaker and stopped when they covered it.
- Swap test. Charge with a different adapter and cable, in a different outlet. Then try the phone without its case. If you charge wirelessly, shift the phone on the pad. One user on that same thread reported that moving the phone on a wireless pad stopped the noise, though nobody confirmed it for other phones.
Write down what changed. The results sort into the cases below.
What Your Results Mean
The adapter whines on its own. This is coil whine, a high-pitched sound some power adapters make while they work. On a Fairphone forum thread, most commenters put a faint, changing high-pitched noise from a charger down to coil whine, common in switching power supplies and usually harmless, and the poster ended up with a replacement charger that was much quieter, though still not silent. Treat it as an annoying adapter, not a damaged phone, and try a different adapter.
The charger hisses loudly, or gets hot or smells odd. Stop using that charger. One Samsung community responder told a user whose fast charger hissed loudly that this “is not normal” and to contact support. A normal adapter hums faintly; one that is hot, smells odd, or buzzes loudly should be replaced rather than tested further.
A wireless pad makes a whirring sound. That may be a cooling fan. Samsung’s support page on charging-pad noise says a slight fan sound is normal, because the fan runs to cool the charger. The page also says switching the fan off in the fast wireless charging setting slows charging. The page mixes up phone models, so read it as general guidance for Samsung pads.
The noise comes through the speaker and ignores volume. This is the case that worries people most. On an Apple Community thread that has collected hundreds of “Me too” votes, iPhone 17 Pro Max owners report static or hissing from the bottom speaker while charging, even with the volume muted. The replies are mixed. Some say Apple is aware, others say hardware diagnostics found nothing, and no official fix is listed, so treat those as user reports. Other users in the thread blamed an accessory, one pointing to a MagSafe battery pack, so test with nothing else attached. On a Samsung thread, a Galaxy M31s owner heard a buzz through earphones while charging, and Samsung’s answer was a service-center inspection.
The noise continues when unplugged. It is a speaker or audio problem, not a charging problem.
The Fix, in Order
- Change the adapter and cable first. It’s the cheapest test and it settles most coil whine.
- Use a different outlet. A different outlet or power strip is worth a try, since one Apple Community user said a defective wall outlet fixed a similar problem on an older iPhone.
- Remove the case and any attachments. Take off magnetic battery packs and pop sockets. On a wireless pad, center the phone.
- Keep the phone cool and uncovered while charging. Charging on a bed or under a pillow traps heat, which is a good habit to drop anyway. Our guide on why charging slows down when the phone is warm explains why heat matters.
- Charge with the screen off. If the hiss only appears while video or an app is running, note when it happens.
- Take a short video of the noise. One Fairphone user needed a video of the noise to get a replacement charger. A recording helps if a store can’t reproduce it.
- Book a service check. If the noise comes through the speaker with several chargers and no accessories, ask the manufacturer to inspect it.
Related charging symptoms have their own explanations. If a charging pad isn’t working at all, read wireless charging not working but wired works.
For how a speaker should be checked at home, Apple’s own guidance on no sound or distorted sound from your iPhone speaker covers silent mode, cases, blocked openings and a speakerphone call test. It doesn’t mention noise that happens only while charging, which is why the unplug and cover tests above matter.
FAQ
Why is my phone making a buzzing or hissing noise while charging?
The sound usually comes from the charger (coil whine), a cooling fan on a wireless pad, or interference reaching the phone’s speaker. Unplug the phone, then listen to the adapter alone, and lightly cover the speaker grille. Those two tests show which one it is.
Is a high-pitched noise from my charger dangerous?
A faint, steady whine is common and usually harmless. A loud hiss, a hot charger, or a burning smell is not normal, so stop using that charger and replace it. Don’t open the charger to look inside.
Why does my phone hiss while charging even when it’s muted?
Muting stops sound playback, but interference from charging can still reach the speaker. If the hiss continues with several chargers and no case or accessory, ask the manufacturer to check the phone, and bring a short video of the noise.
Does wireless charging make noise?
Some wireless pads have a small fan that makes a soft whirring sound while it cools the pad. Samsung says this is normal. A loud grinding sound, or a noise that continues after you remove the phone, is not.