Did you know
All iPhone and iPad models do not have an external temperature sensor. They have a built-in internal temperature sensor that decides when to shut the device down to prevent the battery from overheating. This internal sensor, called a “thermally sensitive sensor” or thermistor for short, is a resistor with a resistance that changes in response to temperature. Ambient temperature sensors do exist on some smartphone models, like the Samsung Galaxy S4 and the Galaxy Note III. However, there’s a reason why most phones don’t have a thermometer for air temperature. It lies on the difficulty of getting an accurate reading, as heat sources within the device itself, such as the battery, might affect the sensor’s readings. Additionally, real-time temperature data for any location are easily available over the internet. There are some thermometer apps for phones with a built-in temperature sensor, but these apps are limited to getting readings from the immediate vicinity of the phone. As a consequence of this technological hurdle, body temperature apps are mostly for recording and keeping track of temperature data. Paired with smart thermometers, these apps provide continuous updates and graphs for temperature trends. Since most body temperature apps are focused on helping with common fevers, they are equipped with medication tracking features, alerts for high temperature, and medical tips.