LTE and 4G are types of connections. They do not use Data, they allow your apps and services on the iPhone or iPad to use the Data access.

Does LTE use data or wifi?

Mobile broadband/LTE (referred as the cellular network) and Wi-Fi can be used to access the internet and perform activities requiring a data connection.

Does LTE mean you are using data?

LTE stands for Long Term Evolution and is sometimes referred to as 4G LTE. It's a standard for wireless data transmission that allows you to download your favorite music, websites, and video really fast—much faster than you could with the previous technology, 3G.