T-Mobile has already introduced its prepaid Jet data packages, hoping to fulfill the needs of users who are looking for a prepaid mobile broadband offering. The 3G USB modem is capable of data speeds of up to 7.2Mbps and will support both Windows and Mac systems. The service is set to go live tomorrow, and if you can’t wait to get hold of it, you’ll have to make do with pictures of the USB modem that have been posted online in the meantime. The data packages include a $10/week pass that offers 100MB of data, $30/month pass that’s good for 300MB of data, and $50/month pass that is good for 1GB of data.