Meet the new AT&T Microcell. Its only available in select test areas - sadly not in any areas which I frequent. You can enter your zip code in to see if available in your zip code.

Oh, and it only works for phones that support 3G.

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.

Device Features:

Enhanced coverage indoors – supports both voice and data up to 5000 square feet
Available unlimited minute plans – individual or FamilyTalk plans.
3G handset compatible – works with any AT&T 3G phone.
Supports up to four voice or data users at once.
Device is secure – cannot be accessed by unauthorized users, easy and secure online management of device settings
Seamless call hand-over – start calls on your 3G MicroCell and continue without interruption, even if you leave the building.

Device Requirements:

3G wireless phone/device
Broadband service over DSL or cable
Computer with Internet access for online registration

Additional Information:

Installing your device near a window is strongly recommended to ensure access to Global Positioning System (GPS). A GPS link is needed to verify the device location during the initial startup.
The 3G MicroCell device is portable. The device may be moved, provided the new location is within the AT&T authorized service area and properly registered online."