The stick works in the network of O2, but the installation was a bit awkward. After connecting to the USB 2.0 port of the PC the new hardware under Windows 7 64-bit has been detected, but not automatically installed. Was also in Windows XP that. But on the product page at T-Mobile under Download everything you need is provided, so secure any files like drivers, firmware and software in advance. Windows driver version: 4:22:10 - so that the stick is installed as a device under Windows. Since the inserted SIM card has not been recognized, had a firmware on your stick. I have used this here ... Windows Firmware: Version: 11.203.03.10.55.B726. When connecting software I use this here ... Windows: Dashboard Software Version: 22.001.18.43.55. Create and connect a profile with the access network provider in the software.
The stick has a connection option (plug type CRC-9) for an external antenna to improve range. This works well, tested with a UMTS BQsmart antenna.