The Samsung SM-J400F/DS Galaxy J4 2018 Duos Global TD-LTE 32GB (Samsung J400) supports 3 GSM bands. See the tables below for details.

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Supported Frequency Bands (3)

GSM

Name Interface
850 GSM
900 (E-GSM) GSM
1800 (DCS) GSM

Supported GSM Protocols

Name Generation
GPRS 2.5G
EDGE 2.5G


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