T-Mobile USA's long in development USB modem and a matching plan could be ready within one month, according to a leaked view of the company's internal network. A source for Engadget points to a Huawei USB adapter, rebranded as the webConnect USB Laptop Stick, shipping on March 25th. The device would support the carrier's 1,700MHz HSPA network along with EDGE and GPRS and would also bundle free a