PoC is also referred to as Radio over IP (RoIP). Similar to Voice over IP (VoIP), RoIP devices are handheld two-way radios that access cloud-based PoC services via the internet for voice calling. A data plan SIM card (similar to those used in cell phones) is installed in the PoC device to enable access to the internet using the 4G/5G/LTE cellular infrastructure of Mobile Network Operators. Hytera PoC devices access the HORIZON Nationwide PoC cloud controller through the internet using 4G/5G/LTE cellular networks and Wi-Fi networks for wide-area requirements