The MMX-355G data card is a data card from Micromax which provides you with high speed portable internet. The Micromax MMX-355G supports speeds up to 5.76 Mbps Upload and 7.20 Mbps Download. The MMX-355G is a plug and play device and you can edit your phone book and send SMS using the data card. The MMX 355G also has voice call support. The Micromax MMX 355G also comes pre installed with Google Chrome browser and is compatible with Windows XP SP2, Vista SP1, Windows 7 and Mac Operating systems. The MMX 355G also has a micro SD card slot which supports storage upto 32 GB.