“You can charge your phone faster by turning on airplane mode.”

The idea that switching your phone to airplane mode can make it charge faster is a widely held belief, and it turns out there's a good reason for its prevalence. This common understanding likely originated from users noticing a genuine, if modest, reduction in the time it took to power up their devices when they were disconnected from wireless services. The underlying principle is rooted in how smartphones manage their power consumption.

Modern mobile phones are constantly engaged in various background activities that draw energy from the battery. These include maintaining a connection to your cellular network (Review), actively searching for and connecting to Wi-Fi networks, and keeping Bluetooth enabled for potential accessory pairing. Even when you aren't making calls, browsing the internet, or using a Bluetooth device, these wireless communication components are still consuming power.

When you activate airplane mode, you effectively disable all of these power-hungry wireless modules. The cellular radio, Wi-Fi antenna, and Bluetooth transceiver are all temporarily shut down. With these consistent background power drains eliminated, a greater share of the incoming electrical current from your charger is directed exclusively towards replenishing the battery. This reduction in simultaneous power usage allows the battery to reach its full charge a little more quickly than it would if the phone were operating under normal conditions, thus confirming the observed effect for many users.