VoLTE Ready Handsets: If your device is on this list you are VoLTE ready and DO NOT need to upgrade:

PCD P41

Blu C5L 2021

Blu C5L Max

Blu Tank Flip

Blu View 3

Coolpad C202

Figo Fury LTE

Samsung A02

Samsung A03s

Samsung A12

Samsung A13 

Samsung A32

Samsung A53

Samsung 10

Samsung S10 CPO

Samsung Galaxy S10+

Samsung S10 Plus CPO

Samsung Galaxy S10e

Samsung Note 10

Samsung Note 10 Plus CPO

Samsung Note 20 CRN

Samsung S20

Samsung S20 CRN

Samsung S20 Plus 

Samsung S20 Plus CRN

Samsung S20 Ultra

Samsung S20 Ultra CRN

Samsung S21

Samsung S21 Ultra

Samsung S21 Plus

Samsung S22

Samsung S22 Plus

Samsung S22 Ultra

Samsung Xcover Pro

Samsung Z Flip 3

Samsung Z Flip 4

Samsung Z Fold 3

Samsung Z Fold 4

Sky D5Max

Samsung S23

Samsung S23 Plus

Samsung S23 Ultra