The term “mobile hotspot” is typically used to refer to a device that connects to a cellular networks to provide a WiFi connection for other devices
The device you are looking for is a “Femtocell” although with VoLTE and wifi calling becoming more common (although some carriers still treat it as a premium subscriber feature), they are far less popular these days.
It works by taking an LTE connection and converting it into a wi-fi signal that your laptop or smartphone can use. No it cannot be a stand alone product. Essentially they work just like a phone does in the sense of connectivity to phone towers. If the building itself struggles to get service, it’s highly doubtful you’d get any better with a hotspot unless the hotspot IS a different carrier and that carrier specific can get service there. Does the building have a metal roof?
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