To restart a Samsung phone, you can follow these simple methods:

1. Using Buttons:

• Press and hold the Volume down button and the Power (or Side) button simultaneously for a few seconds.
• A menu will appear with options; tap "Restart" and then confirm to reboot your phone.
• Your device will turn off and then automatically turn back on.

2. Using the Quick Settings Menu:

• Swipe down from the top of the screen twice to access the full Quick Settings panel.
• Tap the Power icon to bring up the power menu.
• Select "Restart" and confirm to reboot your phone.

3. Using Bixby Voice Assistant:

• Activate Bixby by pressing and holding the Bixby button or saying "Hey Bixby."
• Say "Reboot my phone" or "Restart my phone," and Bixby will restart your device for you.

4. Force Restart (if the phone is frozen or unresponsive):

• Press and hold both the Volume down button and the Power button simultaneously for about 10 seconds.
• The phone will vibrate, turn off, and then automatically reboot. This does not delete any data.

All these methods are safe and do not delete any data from your phone.