PoC Radio VS Smartphone on Business Critical Communication

What is PoC? How can business benefit from PoC communication? Why PoC radio, but not smartphone?

Nextel first introduced the concept of Push-to-Talk over Cellular (PoC) in 1987 as an alternative to two-way radios. Before that, business communication was dominated by two-way radios on peer-to-peer and local radio networks. But now, PoC provides the best of both narrowband digital radios and broadband LTE networks.

PoC devices such as PoC radios, PoC smartphones, and bodycams work by connecting to the cellular infrastructure networks of Mobile Network Operators using a SIM card. Meanwhile, PoC network services are hosted in the Cloud on privately hosted servers owned and operated by the PoC platform. Gateway routers provide connectivity between the LTE network and the PoC server.