Google Public DNS can handle many billion requests daily and it is always up. It also updates very rapidly. This article from Google explains how to change your Internet settings to use Google Public DNS. However, there are no words from Google about using Public DNS with Wireless Modems.
Using Google Public DNS with Wireless Modems or any device which don’t let you change DNS (or assign DNS automatically), is very easy. Open Command Prompt and type this command:
netsh interface ip set dns name="Wireless Network Connection 2" static 22.214.171.124
Replace “Wireless Network Connection 2” with your Internet Connection’s name. 126.96.36.199 is Google’s Public DNS IP. You can also use 188.8.131.52.
I testing this command on Huawei CDMA Modems, PTCL Evo 3G, WorldCall Wireless, Qubee USB Wireless Modem and PTCL 3G Wingle.