Was the mobile phone seized during the search, or will it be returned through ...?

Your property has been seized as a result of the search. To return it, it is necessary to cancel the relevant arrest. If the property was seized and it was not seized or the terms were violated when it was imposed, then it is necessary to file a complaint with the court and ask the court to oblige the investigator/detective/prosecutor to return such property (Part 1 of Article 303 of the Criminal Procedure Code of Ukraine).

Also, property can be seized temporarily (Part 7 of Article 236 of the Criminal Procedure Code of Ukraine). If the confiscated property was not specified in the search warrant, you can try to return it by submitting a corresponding application to the investigative body.