how do i get facetime
iPhone 5s, iOS 9.2.1, null
First off, don't post your personal information on this forum. Your screenshot shows your personal email address, so I've reported the to the Hosts to see if they can edit it for you.
Secondly, where did you purchase this iPhone and who is your carrier? (Viettel, I assume?)
What is the exact model of out iPhone? Go to Settings > General > About.
how do i get facetime