Which is more accurate, a cell phone compass or a compass

A compass is a navigational tool based on the principles of the Earth's magnetic field, which determines direction by indicating the magnetic north pole. It usually consists of a magnetic needle and a dial that provides a relatively accurate indication of direction. In contrast, a mobile compass is an application that uses the phone's built-in magnetometer to mimic the function of a compass. While a cell phone compass can provide directional indication in some situations, its accuracy is somewhat limited by the fact that the phone's magnetometer is subject to interference from surrounding electronic devices and metal objects, as well as magnetic field calibration. The compass, as a specially designed navigation tool, offers greater accuracy and stability. It is specially calibrated and adjusted to provide more accurate directional indications, especially in outdoor environments and away from interference from electronic devices.