Yes, Samsung Galaxy A5 2018 support 4G VoLTE in both sim slots. You will surely experience enhanced voice quality and faster internet browsing and download speed. You can also use its native video calling feature for video calls.
To view the complete specifications of Samsung Galaxy A5 : Samsung Galaxy A5 2018
List of service centers : List
Samsung Galaxy A5 2016 vs Vivo V5
Both the phones have their pros and cons,lets analyze them.
Advantages of Vivo V5
1.More RAM:-More RAM means more applications can run at the same time
2.Bigger Screen:- more pleasing experience on a bigger screen.
3.More Storage Capacity:-More memory allows you to store.
Advantages of Samsung Galaxy A5 2016
1.Better Screen Resolution;-More resolution means sharper and crisper screen.
2.Supports NFC:-ou can also connect two NFC enabled devices just by touching them with each other.
Verdict - In my opinion, Vivo V5 is better overall performance and price ,if you need NFC and better screen resolution than go for Samsung Galaxy A5 2016
You can also compare these devices on 91mobilesSamsung Galaxy A5 2016 vs Vivo V5
Mekala Rajan Babu