To restart a CITYCALL I8550, follow these steps:
Press and hold the "Power" button on your phone until the "Power off" option appears on the screen.
Tap the "Power off" option.
In the pop-up window, tap "Restart" to confirm that you want to restart your phone.
Your phone will turn off and then restart.
Note: These steps may vary slightly depending on the type of CITYCALL I8550 and the version of the operating system you are using.
It's important to note that restarting your CITYCALL I8550 can help resolve certain issues, such as a frozen screen or slow performance. However, it will not delete any data on your phone. If you want to erase all data on your phone and restore it to factory settings, you will need to perform a factory reset.