Two Vivo X6 Variants Certified By TENAA: Vivo X6 Plus L and Vivo X6 Plus D Two variants of the alleged Vivo X6 Plus smartphones, the Vivo X6 Plus and the Vivo X6 Plus D, have received the go-ahead from the Chinese regulatory agency TENAA. The certification hints at the phones' launch on Nov. 30. by Anu Passary