You don't need to enable VoLTE. Insert the Jio (VoLTE enabled) in any slot. By default VoLTE will be active. If it is not, you can change the network preferences from Network option in settings.
5G technology is entirely new and still in testing face among telecom companies, device manufacturing companies, and software companies. Though rules of the 5G have been finalized, prototypes have yet not been finalized and phones in today's market will not be compatible with the 5G Technology.
Apple iPhone x does not support 5G and will not be compatible with it.
The Samsung Galaxy Note 10 Plus is a better phone as it gives better specifications at a similar price.
Processor: The Samsung Galaxy Note 10 Plus comes with the Samsung Exynos 9 Octa 9825 processor whereas the Apple iPhone XS Max comes with the Apple A12 Bionic processor.
Camera: The Samsung Galaxy Note 10 Plus has a primary camera of 12 MP + 12 MP + 16 MP with F1.5 aperture whereas the Apple iPhone XS Max has a primary camera of 12 MP + 12 MP with F1.8 aperture.
There are extra features coming with the Samsung Galaxy Note 10 Plus.
Check Full Comparison Samsung Galaxy Note 10 Plus vs Apple iPhone XS Max
Apple iPhone X vs Apple iPhone 8 Plus
Both the phones have their pros and cons, lets analyze them,as per the advantages .
Advantages of Apple iPhone X :
1.Bigger Screen:It will give more pleasing experience to watch movies ,playing games.
2.Better Screen Resolution:More resolution means sharper and crisper screen.
3. VoLTE Enabled; You can use this to make calls over 4G network. It is compatible with Reliance Jio.
Advantages of Apple iPhone 8 Plus:
1.Has Fingerprint Sensor :It allows you to quickly unlock your device using your fingerprint and more security to the phone.
Verdict - Both are great handset but in my opinion iPhone X would be great in overall and price,if you need fingerprint than go for iPhone 8 Plus
You can also compare these devices on 91mobilesApple IPhone X vs Apple IPhone 8 Plus
Check the video
The Apple iPhone XS is a better phone as it gives better specifications.
Processor: The Apple iPhone XS comes with the Apple A12 Bionic processor whereas the Apple iPhone X comes with the Apple A11 Bionic processor.
Check Full Comparison Apple iPhone XS vs Apple iPhone X