Apple iPhone 7 and 7 Plus owners have reported a strange hissing sound emanating from their new devices.

The sound, which is similar to the noise you hear when a speaker is poorly connected, could be caused by the new chip in the devices, which is designed to make the phones faster with improved battery efficiency.

American podcaster Stephen Hackett first noted the noise, discovering a sibilant sound coming from the back of the iPhone under heavy usage.