A:AnswerIf your mobile hotspot allows you to plug in an RJ45 Ethernet cable to connect to the Asus router it should work fine. Some hotspots have an RJ45 port and some don't.
A:AnswerYes, the blue port is for connecting the DSL modem to the router. Yes, it works with Frontier Internet. The router will support the speed your ISP provides.
A:AnswerWalls and RF noise may affect the signal, range or distance of a router coverage. Certainly, the RT-AC1200 will extend the WIFI range or coverage of your local area network.