Effective immediately, China’s Ministry of Education said the ban would apply to all school children.

Chinese authorities have banned cellphones in classrooms and school grounds effective immediately in an effort to protect students from digital addiction and save their eyesight. 

The ban will apply to all schoolchildren across the country. 

据中国教育部官网消息，为保护学生视力，让学生在学校专心学习，防止沉迷网络和游戏，促进学生身心健康发展。

语言点：

1. Effective immediately 立即生效

例句：You're relieved of duty, effective immediately. 你已经被免职，立即生效。

The Decision was adopted at this year's session with immediate effect.这项决定最终在本届大会 通过立即生效。

2. Digital addiction：数字成瘾 ； is a real and growing condition and can take the form of smartphone/cellphone addiction, social media addiction, or internet addiction.