T-Mobile Rocket 4G (T-Mobile) USB modem offering connectivity for your PC to T-Mobile's ultra-fast 4G network Flexible prepaid pricing for data ranging from 100 MB for a week to 3 GB for a month Includes microSD memory card slot for accessing optional cards up to 32 GB in size Compatible with Microsoft Windows (7, Vista, or XP) and Mac OS X (10.4 or higher) Includes SIM card