So, we are going to the era of 5G though Oppo already declared of making 5G Modem. Before that VIVO has demanded that they had successfully made a test on VIVO 5G.
They already declared to reveal new handset of 5G soon in NEX series. The name of that phone can be VIVO NEX S. Qualcom X50 Modem will be used there.
It can be available in market from the first of 2019.