“LTE” was originally used because early networks did not quite meet the 4G standard, although they were still faster than 3G. Most networks are now LTE-A and do meet the 4G standard.
Source: https://www.androidauthority.com/4g-vs-lte-274882/
Speculation: It could be that the OSs simply lump them together for the sake of simplicity.
LTE is the technology behind 4G. It stands for Long Term Evolution. It usually shows up on your screen as 4G LTE. It was a standard developed when 4G was designed for the purposes of phones and towers and other devices to talk to each other. There were other standards developed at the same time called UMB (Ultra Mobile Broadband) and WiMax, but LTE is the global standard technology for cellular communications. It is an open, interoperable standard used by virtually all carriers. **All major smartphones use LTE today. In fact, there is no such thing as true 4G as defined by the standards set forth. 4G was defined as the ideal standard and as no phones actually can reach this standard, so they defined LTE. Even if your phone is advertised as 4G, it uses LTE technology.**
[Source](https://www.signalboosters.com/blog/lte-vs-4g-whats-the-difference/)
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