One-line answer: in a criminal investigation, no — officers must show you a search warrant (搜查证) before searching your body, belongings or home, and that includes your phone. Two things change the picture: an urgent situation during an arrest or detention, and your own consent.

1. What the law says

Article 138 of the Criminal Procedure Law is short and specific: a search must be carried out with the search warrant produced to the person being searched, and when an arrest or detention is being executed, a search may be conducted without a separate warrant in urgent circumstances.

Read it carefully. The warrant requirement is the default, and the exception is narrow — it is tied to an arrest or detention and to urgency, not to convenience. Electronic data, including your messages and app history, is a recognised category of evidence in Chinese criminal procedure, so in practice police seldom need to browse the handset on the spot: the usual route is to seize the phone as physical evidence with an itemised seizure list and extract the data later through forensic examination.

Outside criminal investigations the rules are different. Identity checks at airports, railway stations and border crossings are routine, and under the Public Security Administration Punishments Law (revised in 2025) the police may summon a person for questioning for up to 8 hours — 12 hours where many people are involved or identity is unclear, and 24 hours in complex cases that may lead to administrative detention.

2. What this means in practice

Three things follow. First, ask to see the warrant and note the officers’ unit; a demand that you hand over a phone with no warrant and no arrest is a red flag. Second, if the phone is taken, ask for a copy of the seizure list — it is both your receipt and your record of what was held. Third, and most important, do not delete messages, wipe apps or reset the device after police contact. Tampering with evidence invites separate liability and destroys the mitigation value of cooperating.

You are not legally obliged to give your passcode. In practice, a refusal may be read as a lack of cooperation and can weigh against release on bail, so the sensible sequence is: say nothing about the facts, keep the device intact, and let a lawyer take that position for you. Foreign nationals may also ask that their embassy or consulate be notified.

3. A worked scenario

Hypothetical: a foreign manager at a Shanghai trading company is questioned in a commercial fraud investigation. Officers detain him at the office and look through his work phone “just to check some numbers”, without showing a warrant. He unlocks it. That consent removes the warrant question entirely, and everything on the device — including deleted chats recovered later — is now in play. Had he asked to see a warrant and kept the phone locked, the evidential position would have been materially different.

The takeaway: ask first, consent carefully, and call a lawyer before the first interview.

FAQ

Q: Can police search my phone in China without a warrant?

A: In a criminal investigation, no. Article 138 of the Criminal Procedure Law requires a search to be carried out with the search warrant produced to the person being searched, and that includes your phone.

Q: When can police search without a warrant?

A: When an arrest or detention is being executed, a search may be conducted without a separate warrant in urgent circumstances. The exception is tied to an arrest or detention and to urgency, not to convenience.

Q: What should I do if police want to take my phone?

A: Ask to see the warrant and note the officers’ unit, and if the phone is taken, ask for a copy of the seizure list. Do not delete messages, wipe apps or reset the device after police contact.

Q: Do I have to give police my phone passcode?

A: You are not legally obliged to give your passcode. In practice, a refusal may be read as a lack of cooperation and can weigh against release on bail.

Q: Can police question me outside a criminal investigation?

A: Yes. Identity checks at airports, railway stations and border crossings are routine, and under the Public Security Administration Punishments Law the police may summon a person for questioning for up to 8 hours, 12 hours where many people are involved or identity is unclear, and 24 hours in complex cases that may lead to administrative detention.

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Wang Guan | Co-founder, Beijing Haolue Law Firm | +86 17813108512