The samsung s5230c is a smartphone. if you want to exit full-screen reading mode, you can follow the following steps: 1. Turn off the phone to ensure that the battery is full. 2. Open the novel application and enter full-screen reading mode. 3 Long press the power button on the screen for about 1 second until the phone reboots. 4. If the phone is still in full-screen reading mode after the restart, please press the power button again until the phone screen turns off. 5 After the screen is turned off, you will usually see the prompt "exit full-screen reading mode". It should be noted that if the phone is not used for a long time, it is recommended to switch the phone on and off regularly to avoid battery aging and phone performance deterioration.