I remember I used to browse internet on pc by connecting to my phone on 2G during my college days. Nowadays if you connect with 2G, nothing opens, not even a website. Same with 3G, I used to be able to watch videos, get into meeting with 3G, but after 4G rollout 3G became pathetic. Lack of spectrum is one thing, second is proper timely investment and planning by the ISP to decongest the local nodes while the traffic and subscribers continues to increase. India's international bandwidth actually remains largely unused. VoWifi here can definitely help offload some traffic from cellular network.