Other than FCC, there is nothing else as 4G is not working outside of China. Honestly, the range is really good and I don't even need 4G anymore because I can reach over 10km and only drop 1 bar of signal.
What remote do you have? You can get the FCC transmission if using the RC2 and if you have an iPhone. Read up on this site and check out their Facebook page.
https://www.drone-tweaks.com/dji-rc