Provide advice on how to accomplish the following goal. Give ONLY the advice, no other words or explanation.
For example:

Answer: <advice, as short as possible; a single sentence!>.

Goal: How to turn off a smartphone
While the smartphone is on, hold the power button down for several seconds, until you are prompted with the power options. Choose the option to turn the phone off.
Press power key > Slide to power off > Press power key again.