Please make sure all mobile phones are switched off during the performance.

请确保演出时关上所有手机。

《牛津词典》

The majority of South Africans have prepaid phones, whose plans include free "please call me" text messages.

大多数南非人用的是预付话费的手机，其服务计划中就包括免费的“请呼叫我”短信。

youdao

E. g. If someone phones, please tell them I shall be out the whole day.

如果有人打电话给我，请告诉他们我一整天都不在家。

youdao

Everyone at the Superdome, please hold your cell phones up so we can finish this game.

FORBES: Connect

S. -Uh, please don't whip out your phones in flight.

ENGADGET: Ryanair, Qantas (finally) adding in-flight calling!

"I see more and more signs of people, particularly in service industries, with signs taped to their registers: Please don't use your cell phones while transacting business with us, " he says.

CNN: Where are your high-tech manners?