点按 新增标签，建立新的标签名称与新增成员，或于新增成员中，将朋友加入已设定的标签内。 [105] The Threat of this assault is often mitigated by enabling Sign's Registration Lock function, a kind of two-component authentication that needs the user to enter a PIN to register the telephone number on a whole new product.[146] A few of the organizers have moved to encrypted messaging https://www.lt-signal.com/