During the search, they seized the phone, they promised to return it in 2 weeks, but it has already passed.

It all depends on the circumstances and reasons for seizing your property. If, during the search of the premises, property is seized that is not specified in the court decision and the investigator has not seized it, such property shall be returned to the owner of the property in a mandatory manner.

In this case, and in any other case, you can contact the police department that seized the property with a statement "About the return of property." You can see an example of such a statement at this link: http://pravo-porada.com.ua/practice-65/55-zayavy-ta-klopotannya/zrazok-zayavi-pro-povernennya-majna-pislya-obshuku.

An example of a statement to the court - http://pravo-porada.com.ua/practice-65/58-pozovni-zayavy/zayava-v-sud-pro-povernennya-viluchenogo-majna-po-kpku-zrazok.

An example of an application to the Tax Service: https://mayorovcompany.com.ua/obraztsy-dokumentov/zayavleniya/zayava-pro-povernennya-viluchenogo-fiskalnoyu-sluzhboyu-majna.html. Please note that the name of the service is no longer valid.