Legal analysis: you don't need to hand in your mobile phone. Interpol is dealing with a case every day. However, in major tasks and special circumstances, it is normal that the mobile phone must be handed in. It's normal not to see your mobile phone for four days at the worst time.

Legal basis: Article 22 of the People's Police Law of the People's Republic of China shall not commit any of the following acts:

(1) Spreading remarks damaging the reputation of the country, joining illegal organizations, participating in assemblies, processions, demonstrations and other activities aimed at opposing the country, and participating in strikes;

(2) divulging state secrets and police work secrets;

(three) practicing fraud, concealing the case, shielding and conniving at illegal and criminal activities;

(4) extorting confessions by torture, corporal punishment or maltreating criminals;

(five) illegally depriving or restricting the personal freedom of others, and illegally searching the body, articles, residence or place of others;

(six) extortion or soliciting or accepting bribes;

(seven) beating others or instructing others to beat others;

(eight) illegal punishment or charge fees;

(nine) accept the parties and their agents to treat and give gifts;

(10) engaging in profit-making business activities or being employed by any individual or organization;

(eleven) dereliction of duty, do not perform their statutory obligations;

(twelve) other violations of law and discipline.