My phone seems to switch itself off randomly.

我的手机好像随时自动关机。

《牛津词典》

Switch off your phone and allow messages to go to voicemail.

将你手机关机，让信息转到语音信箱。

youdao

So every once in a while, turn off your phone and laptop, switch off the TV and lay your worries temporarily to the side.

因此不妨偶尔关掉你的电话，电脑和电视，把烦恼暂时放在一边，和自己（或是你的同伴）约个会， 至少完整的

youdao

We also liked the dedicated power button for the projector on the top right of the phone, just above the normal phone switch.

ENGADGET: Topic: Mobile

With Asterisk loaded onto a computer, a decent-size company can rip out its traditional phone switch, even some of its newfangled Internet telephone gear, and say good-bye to 80% of its telecom equipment costs.

FORBES: Dial D for Disruption

As you pass a major landmark, your phone may switch off your music and turn on an audio recording of a person describing a landmark you're passing.

BBC: Five favourite travel apps of 2011