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。 [a Hundred and five] The specter of this attack may be mitigated by enabling Sign's Registration Lock element, a form of two-element authentication that needs the person to enter a PIN to sign up the phone number on a brand new unit.[146] [152][153] In July 2017, researchers from https://www.lt-signal.com/