Some iPhone 17 Pro and iPhone 17 Pro Max owners have reported a strange whistling sound from the speaker while the phone is charging. This issue is reported to occur primarily when charging using a USB-C cable and persists in some versions of iOS 26.
The sound is described as a strange whistling sound that appears even when there is no audio playing and disappears as soon as the phone is unplugged from the charger. Users from various countries including Spain and Europe have also reported the same thing, indicating that this issue is not isolated.
Those affected agree that the sound resembles static on an old radio. The hissing sound is most noticeable on the bottom speaker of the iPhone 17 Pro and 17 Pro Max, and some have even heard a subtle whistling sound when using the interface while the device is charging.
This issue is usually more noticeable when the volume is reduced or muted. Some users report a humming sound at low volume levels while others find that the sound continues even when there is no audio playing. In fact, simply connecting the device to a charger is enough to produce the sound.
In certain situations, some users choose to charge their phones in another room so as not to be disturbed at night. So far, Apple has not provided an official response, while users in Spain and Europe are reportedly using a temporary security patch and considering the issue a bug that needs to be fixed.
