He is talking about international roaming-calls placed and received by subscribers when travelling abroad.

他谈论的是国际漫游服务——手机用户在国外旅游时拨打和接收电话。

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A California study found that as many as 45 percent of the emergency calls placed from cell phones in the state were frivolous or prank calls.

一项加利福尼亚州的研究发现，该州用移动电话拨打的紧急呼叫电话中，多达45%的是无谓轻率或者恶作剧。

youdao

A California study found that as many as 45 percent of the emergency calls placed from cell phones in the state were frivolous or prank calls.

一项加利福尼亚州的研究发现，该州用移动电话拨打的紧急呼叫电话中，多达45%的是无谓轻率或者恶作剧。

youdao