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 element, a method of two-variable authentication that requires the person to enter a PIN to sign up the contact number on a new device.[146] [152][153] In July 2017, researchers from RUB identified for the https://www.lt-signal.com/