unlocked SM-G920A on t-mobile wifi calling - AT&T Samsung Galaxy S6

Is there a way to enable wifi calling in this configuration?
The device is unlocked, not rooted running build NRD90M G920AUCS6EQH1

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Root android 6.1 baseband G920AUCS5DPI1

Hi,
I want to root my SM-920A for it to access VOLTE network ( international - not AT&T). Right now inspite of my provider provides this facility, I see AT&T is blocking it.
After little research, I learned I have to root the device and enable voLTE. Please help with below.
1. Is rooting only option for my unlocked phone to be able to access VOLTE outside AT&T network?
2. If rooting is required to be done, what is the suggested way of doing it? any video links will be appreciated for the first timer
TIA
I dont think there is any current way to root this ATT phone under android 6.x. Frustrating

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Nevermind i figured it out.

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Is there a way to flash the Unlocked 960u firmware with WiFi Calling for Verizon?

Is there a way to flash the Unlocked 960u firmware with WiFi Calling for Verizon?
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Please help
I got an unlocked s10 Verizon sm-973u
Does not let me turn on hotspot at all, is the problem in the firmware? Says I need a plan that would allow tethering. I use s7 unlocked international version and it has no problem using same sim card and hotspot
Is there stock unlocked firmware without Verizon stuff to install?

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