Mobile phone use among children has become a problem.

孩子们使用手机已经成为一个问题。

youdao

Mobile phone used among school kids has become a problem for the school years, so one of the rules in our country says that school kids are not allowed to bring mobile phones to school.

小学生在学校使用手机已经成为一个问题，因此我国有一项规定是，小学生不能把手机带到学校。

youdao

The fact that Android has severely limited video codec support is less of a problem on a phone, because, well, it's a phone.

Android只提供少得可怜的视频编解码支持。 这对于手机来说不是很严重的问题，因为，哦，那只是个手机。

youdao

Bright Simons, a Ghanaian social entrepreneur, has devised a phone-based system called mPedigree to tackle the problem of counterfeit drugs.

ECONOMIST: Beyond voice

Apple Chief Executive Steve Jobs has a problem: He's taken Apple into the phone business with the iPhone.

FORBES: Why Apple Won't Become A Phone Company

Here is the problem: Verizon has a Preferred Roaming List (PRL) built into every phone that preselects preferred carriers throughout the world with which they have roaming agreements (and optimum rates to the carrier).

FORBES: Verizon Smartphones And Cruise Ships Don't Mix