Of course. Article 47 of the Prison Law stipulates that a prisoner may communicate with others during his sentence, but the communication shall be inspected by the prison. A criminal suspect can make a phone call while serving his sentence, and can be detained if the prison finds letters that hinder the criminal's reform. While serving a sentence, criminals may also meet their relatives and guardians in accordance with regulations. Therefore, Wang Chun Prison in Haishu, Ningbo is allowed to call friends.