[LTE Discovery][1] app tells this for 4G/LTE.

[<img src="https://i.sstatic.net/Sz3bM.jpg" width="210" height="350" alt="IMG: " title="">][2]


  [1]: https://play.google.com/store/apps/details?id=net.simplyadvanced.ltediscovery
  [2]: https://i.sstatic.net/Sz3bM.jpg