Restart the phone normally
Press and hold the Power button
Tap Restart or Reboot
If there is no Restart option, power off the phone
Turn the phone back on
Remove any recently installed or suspicious apps
Check that no volume button is stuck
Remove and reinsert the battery if the device has a removable battery
Disconnect any connected accessories
Clear the cache partition if the device keeps booting into Safe Mode
Update the device software
Perform a factory reset if Safe Mode still remains