BSNL has soft launched Voice over Wi-Fi (VoWiFi) service for customers in west and south zone circles. The service allows users to make and receive voice calls using a Wi-Fi network instead of their mobile carrier’s cellular network. The company has also launched its 4G services in Mumbai. It has also started offering eSIM services across India.BSNL has soft launched Voice over Wi-Fi (VoWiFi) service for customers in west and south zone circles. The service allows users to make and receive voice calls using a Wi-Fi network instead of their mobile carrier’s cellular network. The company has also launched its 4G services in Mumbai. It has also started offering eSIM services across India.