Airtel VoLTE and VoWiFi in Asus Phones : India

[subhojit_dey]

Please tell us some basic information before asking for help:
Model Name: Asus Zenfone 5z, 6z , Max Pro M1, Max Pro M2, ROG Phone 2, ROG Phone 3
Firmware Version: All
Rooted or not: No
Frequency of Occurrence: -
APP Name & APP Version (If your issue relates to the app): Calling (VoLTE and VoWifi)
In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.
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There is a very large subscriber base of Airtel subscribers in India. Along with Jio, Airtel subscribers also contribute to the majority of 4g users. However, for some weird reason, ASUS phones are not recognized by Airtel as either supporting VoLTE or VoWiFi.
VoLTE can still be used in ASUS phones for Airtel through one of these tricks:
1) Using the sim in a Airtel supported phone beforehand (eg: Samsung, iPhone)
2) Forcing customer care executive to activate VoLTE for your SIM even though they keep arguing that your device is not recognized as Airtel VoLTE compatible.
Airtel's official website does not even recognize ASUS as a smartphone brand.
Airtel VoLTE - Voice Over LTE Services Works on Airtel 4G

For VoWiFi none of those above tricks even work. So Airtel VoWifi is a no go on ASUS phones.
Airtel's official website doesn't recognize ASUS even as smartphone brand, and its not like they don't update the page because infant brands like iQOO are there.
Airtel Wifi Calling, Voice Over Wifi Calling
All I am asking is, is there an issue with Airtel and ASUS that we do not know about. If so, can it be resolved since Airtel is a major player in this country. Thanks!
@Averan @aamod.v8 @amitgarde3 please escalate this if you can. Thanks!

[Abhinav]

For Jio the VoWiFi is working great. No problems so far. I guess the problem is with Airtel. They are chortel. Asus didn't had any problem to enable VoWiFi for 5z but facing problem with Airtel. Airtel is money hogger. They don't work until you pay them. Their plans are costly, no proper 4G coverage (weak), still uses old IP protocol, VoLTE is not there in some remote areas, 4G is not dependable switches to 2G automatically and frequently.

[Abhinav]

subhojit.dey

https://zentalk.asus.com/en/discussion/comment/136890#Comment_136890

Not talking about that. What I am saying is, if you purchase a new Airtel sim and put it inside any ASUS device for the first time, VoLTE is not activated automatically. You either have to call customer care and get VoLTE activated manually or use the sim in a MI, Oneplus, Samsung phone for a few hours. This happens because Airtel as a carrier does not recognize Asus phones as VoLTE capable. No problem in the phones as such.

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I didn't faced any problem like you faced. I did used an Airtel sim on 30th July 2018 that time 5z did catched both Jio as well as Airtel VoLTE at the same time.
I know some won't believe me but I used it so I know it. I just purchased the New Airtel sim and installed it in 5z and bam VoLTE came to Airtel too at that time.

[subhojit_dey]

Abhinav

https://zentalk.asus.com/en/discussion/comment/141636#Comment_141636

I didn't faced any problem like you faced. I did used an Airtel sim on 30th July 2018 that time 5z did catched both Jio as well as Airtel VoLTE at the same time.

I know some won't believe me but I used it so I know it. I just purchased the New Airtel sim and installed it in 5z and bam VoLTE came to Airtel too at that time.

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Back in November 2019, when I purchased my Airtel SIM this happened so just wanted you guys to know. I'm sure some of you may have faced this too.

[subhojit_dey]

Abhinav

For Jio the VoWiFi is working great. No problems so far. I guess the problem is with Airtel. They are chortel. Asus didn't had any problem to enable VoWiFi for 5z but facing problem with Airtel. Airtel is money hogger. They don't work until you pay them. Their plans are costly, no proper 4G coverage (weak), still uses old IP protocol, VoLTE is not there in some remote areas, 4G is not dependable switches to 2G automatically and frequently.

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Happy New Year all, it has been a while and I don't actually mind porting to JIO once my pack validity ends but here's something I want you guys to help me with if possible. I'm still skeptical about using JIO as my primary number. I use just one sim and its important that it is reachable most of the time. Other usages include some travelling within cities and sometimes to remote areas. Airtel is not the best network out there but in most places at least the voice calls work. Data speeds are okayish in most places too. Is JIO reliable enough throughout India? Please help. Thanks!

[AmitGarde]

subhojit.dey

https://zentalk.asus.com/en/discussion/comment/143525#Comment_143525

Happy New Year all, it has been a while and I don't actually mind porting to JIO once my pack validity ends but here's something I want you guys to help me with if possible. I'm still skeptical about using JIO as my primary number. I use just one sim and its important that it is reachable most of the time. Other usages include some travelling within cities and sometimes to remote areas. Airtel is not the best network out there but in most places at least the voice calls work. Data speeds are okayish in most places too. Is JIO reliable enough throughout India? Please help. Thanks!

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Yes Go for it👍
Thanks!