Basic Requirements:

Knowledge of flashing recoveries through fastboot and ROMs through recovery.
A Laptop/PC with Windows 7/8/8.1 or 10.
Internet Bandwidth to download ROM(s) and Recovery. (A minimum of 2GB)

Download Vivo Y51L Flash file (Stock Firmware) Below are the direct download links for the Vivo Y51L Flash file, which will let you install the official firmware on your Vivo device. If your SIM provider has VoLTE, you must download the VoLTE version from the given links! Download Uinitel F1 4G Volte Flash Tool And Drivers: A. Download and install Uinitel F1 4G Volte Drivers. The necessary communication between your device and PC. These drivers are mainly for the devices powered by MediaTek chipset. With these drivers, you can transfer files, flash the firmware files. Backup Apps Message, Contacts. Backup Full Rom With Twrp Recovery. Install Android N Custom Rom Download Volte Patch Files For You Custom Rom. It brings VoLTE high-definition voice and video calling on your existing 2G, 3G, 4G smartphone. You can use JioCall with a JioSIM either in the phone or in a JioFi connected to your phone. You can now use your non-VoLTE 4G smart phone to make HD voice and video calls to any landline or mobile number anywhere in the world.

Note:

(Excerpt taken from https://www.quora.com/Does-Redmi-2-supports-VoLTE-with-Jio/answer/Amos-Singh )

Redmi 2 Prime and Redmi 2 are being differently treated by Xiaomi/miui developers in terms of the software side.

Redmi 2 Prime(2GB/16GB) in on Lollipop version of android(MIUI v7.5.3/v8.0.7 on the top of it) right now which supports VoLTE officially.

Redmi 2is still on the kitkat version with MIUI v8.0.2.0 which still doesn’t have the volte feature available(not even the developer BETA ROMs have it).

You can either flash/fastboot the Redmi 2 prime ROM on the redmi 2. But it works horribly slow with it.
A developer/user at xda has customized the redmi 2 prime rom for the redmi 2 and that ROM does have the volte feature + you will be enjoying the lollipop version of android on your Redmi 2 without any problem – I have used it and it works great.

Volte File Download For Android Phones

Original Thread of that ROM is http://forum.xda-developers.com/redmi-2/development/rom-t3308843

Let’s Start

Files to Download:

1) TWRP for wt88047 (Redmi 2’s codename)

2) Latest ROM

wt88047 THUNDER MiUi8-6.10.20

* The ROM I am using

Current known bugs/problems:

Speaker will get a bump (low quality audio)
Slow charging (I don’t know about the latest ROM’s status about this issue).

Note: You might need to flash the fastboot ROM of Redmi 2 Prime (v7.5.x or v8.0.x) if you are coming from any Redmi 2 custom ROM.

STEP 0.1: [Flashing the fastboot ROM of Redmi 2 Prime]
Please keep this in mind that you are going to lose all of your files kept in the internal storage.
You will need to download the latest Global Stable fastboot rom file (http://bigota.d.miui.com/V8.0.7.0.LHJMIDG/wt88047_pro_global_images_V8.0.7.0.LHJMIDG_20160805.0000.29_5.1_global_3f4aae40dd.tgz)
I will NOT copy paste the whole steps, so to know how to flash the ROM visit MIUI Method 3: Fastboot Update.
[This method is not required if you are already using the Redmi 2 Prime STOCK ROM on your Redmi 2 however some users have reported that the VoLTE functionality not working without this process]

STEP 1: [Lets flash the TWRP Recovery]

Enter Fastboot mode –Turn off the device. Press the Volume– key and the Power button at the same time to enter Fastboot mode. Then connect the device to the Windows PC/laptop via a micro USB cable.
Extract the zip file of wt88047-TWRP3.0.0-1_LP.zip then you will find a batch file> run it. This will flash the twrp recovery and your device will enter the recovery mode. (If it doesn’t then press volume up, volume down and power/lock key all together till it boots into recovery)

STEP 2: [Lets flash the THUNDER ROM v5.x MIUI v6.10.x]

You will have to wipe data and system from wipe option. Wipe> advanced wipe > tick: dalvik, cache, data, system> done.
Then flash the THUNDER ROM from Install option. Install > {locate the file} > Done > Reboot when done.

Now you have flashed the ROM, the first boot will take anywhere around 5-10 minutes. If your phone goes bootloop then flash the rom again.

In this tutorial, we will show you how to enable VoLTE on any Samsung Galaxy phone. Voice over LTE is the process of routing the calls via the 4G LTE network, rather than the normal carrier network. This comes with quite a lot of benefits. To begin with, you will experience much a better calling experience, be it voice or video calls. The signal will also be much more consistent in such cases. Furthermore, since it uses the LTE data spectrum, it uses a higher spectrum (like the 800MHz spectrum) than compared with a 2G or 3G network.

There is another pretty nifty benefit of this feature. Earlier if you were in the middle of a call, then you might not be able to use your device internet. But now, as the call is already been held over an LTE network, you could easily use your 4G LTE network and browse the net while being in a call. With so many associated advantages, it is no doubt you wish to try it out. In that regard, here are the required instructions to enable VoLTE on your Samsung Galaxy phone. Follow along.

Check Volte Android

How to Enable VoLTE on any Samsung Galaxy Phone

Before we list out the steps to enable this feature, there are a few requirements that you need to make a note of. To begin with, your Samsung device needs to have this feature built-in. Fortunately, most of the Galaxy devices released in the last four-five years have this feature. The next requirement is that your carrier network also has to support this functionality.

You will have to check with your carrier that whether or not they support this feature in your region. For example, in India, Reliance Jio, Airtel, and Vodafone Idea are known to support Voice over LTE. On that note, if your device satisfies both these requirements, then you may proceed ahead to enable VoLTE on your Samsung Galaxy phone.

Head over to the Settings page on your galaxy device.
Then go to the Connections section.
Scroll to the Mobile network section.
Within that, you should see the VoLTE Calls option. Just enable the toggle and that’s it.

Volte File Download For Android Tablet

With this, we conclude the guide on how to enable VoLTE on any Samsung Galaxy phone. If you still have any doubts concerning the above steps, do let us know in the comments section. We would also like to hear your opinion about this feature in the comments. Rounding off, here are some iPhone Tips and Tricks, PC tips and tricks, and Android Tips and Trick that you should check out as well.