DEAR FRIENDS
SIMPLEST WAY N STEPS TO START
"JIO VOLTE " IN YOUR MEIZU M3 NOTE OR ANY VOLTE ENABLED PHONE

INITIALL REQUIREMENT STEPS :
-JIO SIM MUST BE INSERTED IN SIM 1 SLOT
-DATA ENABLED TO 4G MUST REQUIRED
-VOLTE OPTION IN MUST BE ENABLED
- ALL APN OF RELIANCE MUST BE DELETED...

ALL ABOVE SETTINGS YOU CAN DO FROM PHONES SIM AND NETWORK SETTINGS OR LIKE THIS OPTION

1. From call ???? option DIAL
     *#*#3646633#*#*
2. MEANS NOW YOU ENTERED IN ENGINEERING MODE...
NOW ACCORDING TO snaps foll the steps
3. In TELEPHONY - > select IMS  option
4. In IMS - > select USSD - > select USSD       SUPPORT - > check it on(select ON) and then PRESS  "SET"
5. Press 2 times BACK BUTTON OF your phone... So you will be returned back to your IMS MENU..
6. AGAIN in TELEPHONY - > IMS(we are already at here) select - > COMMON - > OPERATOR_CODE - > VoLTE_OPERATOR_RJIL
7. THEN Go to the end of page and PRESS  "SET"

8. Now after  "setting ON"  VoLTE_OPERATOR_RJIL" PRESS back button of your phone ONLY ONCE
SO you are still in TELEPHONY - > IMS    - > COMMON menu...
9. Now select "MNCMCC CHECK" and select  "OFF"  AND then press SET BUTTON.... MEANS you have to deselect or can say close the  "MNCMCC CHECK" service.....
FINALLY YOU HAVE FINISHED TASK OF
"TELEPHONY" MENU.... SO RETURN BACK TO MAIN MENU OF ENGINEERING MODE... SO YOU ARE RETURN BACK TO TELEPHONY MENU OF ENGINEERING MODE
10. now SWIPE RIGHTE only ONCE your mobile screen to reach next menu of engineering mode called "CONNECTIVITY"
11. Here i.e in "CONNECTIVITY"  menu select "CDS INFORMATION" - > "MULTIPLE APN" and from DROP DOWN BOX OF LEFT SIDE(first one is MMS already) select IMS(Probably last one) AND if this - IMS service is not started already then START it by pressing START BUTTON....
NOTE : if we start all this setting starting first from connectivity menu then its (IMS) IS most probably off.... And we need to start it.... But we are now actually starts settings from "TELEPHONY" menu so due to this... U will find your IMS service already STARTED most probably....
Any how... Finally we done all..... So just exit from ENGINEERING MODE.... AND ENJOY VOLTE.....
IMP NOTE : IF STILL YOU DIDN'T FOUND YOUR VOLTE ON(AT RIGHT MOST UPPER SIDE OF YPUR PHONE NOTIFICATION PANEL - - - SYMBOL OF "HD" IN WHITE CIRCLE) just switch on "air plane"  ✈ mode for 10 seconds and then switched off it... And wait maximum for 2 minutes... Your VOLTE MODE SURLY STARTS....
IF STILL ENABLED THEN "repeat" above process again and again in full network area of reliance jio....
If YOU SWITCHED OFF YOUR PHONE THEN ALL SETTINGS WILL BE DESTROYED AND YOU HAVE TO SET IT AGAIN AS MENTON ABOVE....

IF YOU FOUND MY TIPS USEFUL THEN LIKE IT N FAVOR IT N RECOMMENDS TO OTHER ALSO