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I found the below which says the D6502 is not 4G or LTE however the other two are
Network
2G: GSM 850 / 900 / 1800 / 1900 MHz (D6502, D6503, D6543)
3G: UMTS 850 / 900 / 1700 / 1900 / 2100 MHz (D6502, D6503, D6543)
4G:
LTE 700 / 800 / 850 / 900 / 1700 / 1800 / 1900 / 2100 / 2600 (D6503)
LTE 850 / 900 / 1700 / 1800 / 1900 / 2100 / 2600 (D6543)