The APX radio is not intended for casual or inexperienced users.
I've seen people on here who are having trouble programming a modern scanner wanting to get an APX radio. Folks, I'm sorry to disappoint you, but this radio is not for you.
LTE is a form of data transmission. It's used by civilian/commercial mobile phones and tablets for data transfer, but in America and Canada, there is a separate LTE service exclusively for public safety to transmit data from their dispatch centers (and systems that connect to them) to their public safety field officers.
LTE and WiFi in an APX radio (or any other public safety grade radio of the modern era) is useless to a consumer.