The Samsung SM-G991U Galaxy S21 5G UW Dual SIM TD-LTE US 256GB / SM-G991R4 (Samsung Unbound M1) supports 4 GSM bands, 5 UMTS bands, 17 LTE bands, and 3 CDMA bands. See the tables below for details.

This device accepts the following SIM types to connect to mobile networks:

  • e-SIM
  • Nano-SIM (4FF)

Run a cross-reference compatibility check of this device on a specific network and country using the following links:



Supported Frequency Bands (29)


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