Unknown or invalid mode. For certain operations, allow the modem to pick any available mode. GPRS EDGE UMTS (3G) HSDPA Prefer 2G (GPRS or EDGE) Prefer 3G (UMTS or HSDPA) Use only 2G (GPRS or EDGE) Use only 3G (UMTS or HSDPA) HSUPA GSM network and device bands. Unknown or invalid band For certain operations, allow the modem to select a band automatically. GSM/GPRS/EDGE 900 MHz GSM/GPRS/EDGE 1800 MHz GSM/GPRS/EDGE 1900 MHz GSM/GPRS/EDGE 850 MHz WCDMA 2100 MHz (Class I) WCDMA 3GPP 1800 MHz (Class III) WCDMA 3GPP AWS 1700/2100 MHz (Class IV) WCDMA 3GPP UMTS 800 MHz (Class VI) WCDMA 3GPP UMTS 850 MHz (Class V) WCDMA 3GPP UMTS 900 MHz (Class VIII) WCDMA 3GPP UMTS 1700 MHz (Class IX)