Sapido GR-1102 User Manual page 69

5.1.1.1 WAN Interface–3.5G (HSDPA/UMTS)
If you are using HSDPA/UMTS (3.5G connection) as the WAN Type, please select 3.5G
USB Dongle. At this moment, Backup of Connection is not available. When 3.5G signal
cannot be reached, the system starts to search downward for 3/2.75/2.5G signals until
none existed.
http://www.sapido.com.tw 69 User's Manual V1.0