This document outlines the testing procedure for a USB GPRS modem on Windows and Linux operating systems. It involves 4 phases: 1. Initial communication test on Windows to confirm the modem can send and receive basic AT commands. 2. Connectivity test using Debian Linux in VMware to establish GPRS connections on the T-Mobile and AT&T networks. Network performance is monitored using ping tests. 3. Web browsing is tested to check functionality over the GPRS connection. 4. The process is repeated for the AT&T network by changing the connection script.