BlackBerry mobile phones operate on wireless networks to receive calls and data services; their connection to the network is provided by what BlackBerry calls the “radio.” Sometimes, you may need to use your device without a cellular network connection or wireless transmission; BlackBerry devices can also operate without the radio turned on. The radio on your BlackBerry will also automatically turn off when the battery is too low for the device to operate the cellular network connection. You will have to manually turn the radio back on after the battery is again fully charged.
