Isn't it illegal for school teachers to confiscate students' mobile phones to check text messages? Are there any relevant laws and regulations? Thank you.

Of course it's illegal. First, confiscation is illegal.

You can call the police as soon as it is confiscated. Of course, there are laws that stipulate that the teacher's confiscation of your mobile phone violates the laws of four countries, namely, the Property Law, the Education Law, the Teacher Law, and the Law on the Protection of Minors. If the circumstances are serious, it will be regarded as an invasion of your privacy. First, the third paragraph of Article 2 and Article 4 of the Property Law stipulate that the mobile phone is your legal movable property, and you have the ownership of the item, and no individual or institution (any individual or institution) has it.