It doesn't surprise me that AT&T has come out with a device or femtocell that helps with iPhone coverage indoors. Lots of people I know who have iPhones say their coverage stinks compared to previous phones and can't use their phone any longer in the home or office. Maybe that's why AT&T has the most wireless coverage complaints on DeadCellZones.com.

AT&T's 3G MicroCell acts like a mini cellular tower for 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 10 3G capable wireless phones in a home or small business setting. The cost of the device has not been announced, although similar devices for Sprint and Verizon retail for $99 and $249, respectively but they are only 2G speeds. Sprint charges a $5.00 monthly fee, but Verizon does not charge anything beyond the initial cost. Select features include:

• 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. GPS signals are even worse at penetrating walls than cellular signals. The GPS confirmation is needed so that AT&T knows you are not bringing AT&T’s network to an unauthorized area.
  
• Enhanced coverage indoors - supports both voice and data up to 5000 square feet.
  
• 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.
• 3G also has limitations outdoors and when you are traveling you consider a signal booster for your car products like the Wilson Electronic's iPhone Booster.
• AT&T Official Description Here:

Related stories:
Frustrated AT&T MicroCell Customers Complain Here
AT&T to Spend $1B on Free Femtocells
AT&T's Microcell U-Verse Set-Top Box
Will AT&Ts Microcell + New Pricing Mean Data Costs More?