Wireless alternative to local analog telephone system

A plain old telephone service (POTS) alternative, comprising:

• an uninterruptible power supply (UPS);
• a router;
• a modbus converter connecting the router to the UPS to enable the router to monitor conditions of the UPS;
• a gateway providing connections to one or more POTS-based customer premises equipment through the modbus converter to the router and directly to the router,
• wherein the router including a SIM card, the SIM card for connecting to a first cellular service provider among a plurality of cellular service providers, wherein the router automatically connecting to the first cellular service provider when the first cellular service provider initially provides a first cellular signal meeting one or more thresholds and switching from the first cellular service provider to a second cellular service provider when the first cellular signal no longer meets the one or more thresholds and the second cellular service provider provides a second cellular signal meeting the one or more thresholds, and
• wherein a first combination of the gateway and the router and a second combination of the gateway, the modbus converter, and the router connect the one or more POTS-based customer premises equipment to a circuit switched telephone network.