I would like to use a mobile hotspot, like the Huawei E5577, to provide access for some WiFi IOT devices (in the US only). I’m not entirely clear on whether this will work. Specifically, it’s not clear which carriers need to be supported by the hotspot device I choose. Or does it not matter, since the (limited) documentation on the SIM options specifies you enable roaming in the config? Are there certain carriers which must be supported or which would be preferred?