[LeEco Le 2 Guides, News, & Discussion] CYB3R0ID694:
This part is we gonna know how to fix VoLTE

FIX 1 :- Little complicate

1. Download Stock 19s ROM

LINK :- Click Here

2. If you are on TWRP by Codeworkx sir, You have to change TWRP..

Download TWRP & Flash it with Current TWRP. Thanks to [MENTION=7473663]ycjeson[/MENTION] for Making this Recovery.

LINK :- CLICK HERE

3. Now Copy Stock 19s ROM which you downloaded in 1st step in Your Le2.

4. Flash it with TWRP which we installed in 2nd step.

PS :- Your all data will get wiped after installing Stock ROM.. Even TWRP get replaced with Stock Recovery.. So better take backup of your data.

5. Now, you are on Stock EUI 19s.. Use it for 30 minutes, Do calls, use data..

6. Now, if your Bootloader is Still unlocked, Flash Latest TWRP by codeworkx via PC

Tutorial LINK :- Click Here

7. Now, 3. Download Latest LineageOS build by codeworkx & Copy it in your Le2

LINK :- Click Here

8. Now Boot in TWRP by Holding Volume down + Power buttons.

9. Go in Wipe & select Dalvik Cache, Cache, System, Data & Swipe to Wipe

10. Now go back to main menu & Select Install.

Now navigate to location where You copied LineageOS in 7th step & Swipe to flash..

Most important part start here

After Your device start, you might see You have VoLTE working.. But due to some bug, It will get disappear after 1st Reboot. Soo, Let's fix it.. :P

1. Open Settings -> Sim Settings. Now set Call, Data & SMS to Jio..

2. Now open sim 1/Jio sim cellular setting & Enable Data roaming.

3. Now Go in Access Point Name & Create New APN as given follow.. Only 3 things to set.

1. APN name :- ims

2. APN :- IMS

3. APN Type :- IMS

& save.

PS :- APN & APN type is in Capital letters.. You have to set it as given because due to bug, if APN type get small letter, Setting get wiped after save.

4. Now set Jio Internet as default & close settings.

5. Now open Dialer & click on right top 3 Dots & select setting.

6. Set Make calls with JIO & then click on Sim 1 which is Jio.

7. After that click on IMS settings

8. In IMS setting, Set VT call quality to High

Here you will face 1 bug..

After clicking VT calling service, you will see 2 options :- High & Low..

But even after selection you can't see which is selected.. Just ignore it..

Now go back, Close Dialer & Reboot Phone...

Now open dialer.. You can see little change in sim icon..

Done.... Enjoy VoLTE calling on JIO sim.. :D :D :D

FIX 2:- More simple

This fix is for those who are already on LineageOS(M prefer Clean flash)

1. Download 19s Modem Provided by codeworkx

LINK :- Click Here

2. Flash it with TWRP.

Most important part start here

After Your device start, you might see You have VoLTE working.. But due to some bug, It will get disappear after 1st Reboot. Soo, Let's fix it.. :P

1. Open Settings -> Sim Settings. Now set Call, Data & SMS to Jio..

2. Now open sim 1/Jio sim cellular setting & Enable Data roaming.

3. Now Go in Access Point Name & Create New APN as given follow.. Only 3 things to set.

1. APN name :- ims

2. APN :- IMS

3. APN Type :- IMS

& save.

PS :- APN & APN type is in Capital letters.. You have to set it as given because due to bug, if APN type get small letter, Setting get wiped after save.

4. Now set Jio Internet as default APN & close settings.

5. Now open Dialer & click on right top 3 Dots & select setting.

6. Set Make calls with JIO & then click on Sim 1 which is Jio.

7. After that click on IMS settings

8. In IMS setting, Set VT call quality to High

Here you will face 1 bug..

After clicking VT calling service, you will see 2 options :- High & Low..

But even after selection you can't see which is selected.. Just ignore it..

Now go back, Close Dialer & Reboot Phone...

Now open dialer.. You can see little change in sim icon.. :D

Done.... Enjoy VoLTE calling on JIO sim.. :D :D :D