Does VoWifi work on 3G phones from 2014`ish years

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Karnataka
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▪️ BSNL Fiber(Direct)
▪️ (Jio Airtel) 4G
Can a Custom ROM like AOSP(Android Open source Project) on a old phone give Wifi calling functionality on a 3G phone. The ROM will have the option to enable Wifi calling . Can it be enabled ? The phone is Redmi 1s though . Thinking of flashing a AOSP ROM and giving it a try.
 
VoWifi if i'm not mistaken, works with close integration with VoLTE and is essentially a chipset derived functionality rather than a purely software feature. I don't think you would be able to get it working on a entirely non-4G device.
 

ijsa

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Excitel
I guess if the service provider Airtel, Vi & Jio want they can do it through their customised apps..... Remember Jio Call would enable call on non-VoLTE handsets... And in their early version Jio4GVoice, it used to work on WiFi.
 

ijsa

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Delhi
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Whatever... in early version of Jio4GVoice... we could make & receive call, even when the signal was zero, through WiFi..... So we were achieving the same....
 


popcorn

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Vi as of now is only testing vowifi and that too only in very limited locations and only on few Oppo phones as of now.
Vowifi is a combination where Operator & Manufacturer and hardware & OS software meet together to make it work.
 
Whatever... in early version of Jio4GVoice... we could make & receive call, even when the signal was zero, through WiFi..... So we were achieving the same....
If you talking about that, that is a completely different technology. That is purely a VOIP rather than a Wifi calling and that wouldn't work on a 3G device as Jio checks the IMEI number of the device before configuring the service and to be honest you won't even get the 4G signal of Jio on a non 4G phone.

Airtel, Vi doesn't offer any similar option. The only option which would work is BSNL Wings number but the money you would spend on it is rather a waste compared to getting a new phone.