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 attack is often mitigated by enabling Sign's Registration Lock function, a kind of two-element authentication that requires the consumer to enter a PIN to sign-up the cell phone number on a completely new device.[146] Several of the organizers have moved to encrypted messaging https://www.lt-signal.com/