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It'll be up to your carrier network to implement this to the update, if your phone it's not network branded/SIM locked, it won't work.
Read the above post, it is up to your carrier/network to enable this, but that might not happen as you don't have a network branded/Sim Locked phone.
Hi @Honey27,
I am afraid that Xperia C4 Dual is not a model which will be receiving VoLTE according to the information which I have available about VoLTE
Regarding Android updates, when there is an available software update for your device this icon will appear in your status bar: . Please note that software updates are released at different times depending on the operator, market, region and country and therefore I am unable to give you a specific date as to when an update will be available for your device. In addition, network operators and specific markets may choose not to avail of the updates for specific models.
However, just to make sure - do you have over 500MB free internal storage available? If you do not have at least this much storage available, you won't be notified about new software. In addition, feel free to register your device on our website with your IMEI in order to get software information:
http://mysupport.sonymobile.com/
Let me know how it went!
VOLTE UPGRADE
Myself c4 not vote