What frequency is 4G in USA?

4G : 1900 MHz PCS , Band 2 (LTE). 700 MHz Lower Block A, Band 12 (LTE). 1700/ 2100 MHz AWS, Band 4 (UMTS/ HSPA+/ LTE). 5G: 600 MHz (LTE Band 71), 28 GHz (n261 Band), 39 GHz.