any band is allowed
1800 MHz DCS band
900 MHz original GSM band
US 850 MHz Cellular band
US 1900 MHz PCS band
WCDMA 3GPP AWS 1700/2100 MHz (Class IV)
WCDMA 3GPP UMTS 1700 MHz (Class IX)
WCDMA 3GPP UMTS 1800 MHz (Class III)
WCDMA 3GPP UMTS 1900 MHz (Class II)
WCDMA 3GPP UMTS 2100 MHz (Class I)
WCDMA 3GPP UMTS 2600 MHz (Class VII, internal)
WCDMA 3GPP UMTS 800 MHz (Class VI)
WCDMA 3GPP UMTS 850 MHz (Class V)
WCDMA 3GPP UMTS 900 MHz (Class VIII)
unknown or no band specified
#NMSettingGsmNetworkBand values indicate the allowed frequency bands the device may use when connecting to this network.