It's amazing at how many places I go where 3G coverage is barely available at the window of a room but not inside. The situation hasn't really changed all that much in many years. And every time I am glad I have that USB extension cable with me to put the 3G USB stick at the window while working somewhere else. Or, in case I have several devices with me requiring Internet access, the same trick helps with a 3G/Wi-Fi bridge such as this one when the power plug and the window are not in the same place…