That's a normal need for handling a case, but the principle of lawyer meeting is not allowed.
When a detention center detains a detainee, it shall inspect the person and articles carried by the detainee. Non-daily necessities and cash of detainees are registered by the detention center and kept in a unified way. The contraband and other articles related to the case found in the inspection shall be handed over to the detention decision organ for handling according to law. When the client is in criminal detention, his money, mobile phone, etc. Will be detained by the relevant units. It doesn't mean that you can bring your mobile phone into the detention center. In the detention center, you must hand in your mobile phone. In addition to daily necessities, you need to apply for a phone call.