Frequency Band Comparison

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Frequency Band BBK Vivo X21 Dual SIM TD-LTE HK 128GB
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I-Mate Ultimate 8502
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GSM 850 MHz Yes Yes
GSM 900 MHz (E-GSM) Yes Yes
GSM 1800 MHz (DCS) Yes Yes
GSM 1900 MHz (PCS) Yes Yes
UMTS B1 (2100 MHz) No Yes
UMTS B2 (1900 MHz PCS) No Yes
UMTS B5 (850 MHz) No Yes

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