AT&T 3G MicroCell allows you to use your existing broadband connection to connect to AT&T’s 3G network. This will finally help those who have terrible coverage at their homes and offices. Now the bad news, you will be charged by AT&T for using your broadband’s bandwidth!?!

From AT&T:
AT&T 3G MicroCell acts like a mini cellular tower in your home or small business environment. It connects to AT&T’s network via your existing broadband Internet service (such as DSL or cable) and is designed to support up to four simultaneous users in a home or small business setting. With AT&T 3G MicroCell, you receive improved cellular signal performance for both voice calls and cellular data applications like picture messaging and surfing the Web.