Among the major mobile carriers in Malaysia, Digi is the first mover in Voice over LTE (VoLTE) service, enabling voice calls, video calls and SMS to be handled through 4G Lte Network since a few years ago, in 2016. UMobile had also followed suit in 2017.Without VoLTE, only data is handled by 4G LTE. When the phone is calling out or receiving an incoming call while it is in 4G LTE network, it will