https://www.giga.com.sg/More_FAQs_Details.aspx?FaqCategoryName=VoLTE+on+giga&FaqCategoryId=43
VoLTE on giga
What is VoLTE?
VoLTE is "Voice over LTE" which offers you the possibility to make voice calls via giga's nationwide 4G network. While on VoLTE, you will be able to access mobile data services at 4G speeds simultaneously too!
Do I have to pay for VoLTE?
No, VoLTE is absolutely free! Just like normal voice calls, calls made using VoLTE will be deducted from the minutes from your plan.
Which plans can enjoy VoLTE?
You can be on any of the giga plans (6GB base plan, 40GB base plan, 50GB Pop-Up plan, 60GB base plan or 100GB base plan) to enjoy VoLTE!
Who can use VoLTE?
All active giga subscribers who are on any of the giga plans (6GB base plan, 40GB base plan, 50GB Pop-Up plan, 60GB base plan or 100GB base plan) and are using giga VoLTE supported handsets, can enjoy VoLTE!
Which are the handsets that support VoLTE?
Currently, the following handsets supports VoLTE:
Xiaomi: Xiaomi Mi10T, Xiaomi Mi11 5G, Xiaomi Mi11 Lite 5G
Oppo: Oppo Find X3 Pro, Oppo Reno 4 Pro
We will be progressively updating with devices that support VoLTE, so keep a look out on this space!
Will VoLTE calls use data from my plan?
No, the use of VoLTE calls will not deduct data from your plan.
What happens to my VoLTE calls when my device switches from 4G to 3G?
You will still be able to enjoy your VoLTE call seamlessly when your device switches from 4G to 3G, without interrupting your conversation.
How do I activate VoLTE on my handset?
For Android users: Settings > SIM & Mobile Network > Network Settings > VoLTE calls ON
Is giga's VoLTE available when roaming overseas?
giga's VoLTE services is currently available within Singapore only.