To what question, sir? I'll continue to ask my question (the one nobody has answered): If I download a file with my phone and transfer it to my computer, is that tethering? As for your phone being a modem, it's pretty simple... A modem (modulator-demodulator) is a device that modulates an analog carrier signal to encode digital information, and also demodulates such a carrier signal to decode the transmitted information. It's true that your phone acts as a modem for the programs running on it (it modulates/demodulates the 3G signal). It's not true, however, that it's acting as a modem for your computer. A java applet (in most cases) negotiates that data transfer. Wireless tether uses an Ad-hoc network connection. Wired tethering uses a direct data transfer.