If you have committed a Hit and Run, there are several ways the police department will contact you. A Hit and Run is a vehicle code violation under VC §20002 and 20003. In order to have committed a Hit and Run, you must have caused damage to property or injury to person, and fled the scene without leaving information. Just because you are contacted by the police department regarding a potential Hit and Run, it does not mean you are guilty, or have been charged. That will be determined thereafter.
Officers may contact you in one of three ways. The method is unique to each county and to each department. There are no uniform code sections or authority that require one specific method be used.