With all of the excitement of the iPhone and 3G there are issues with the technology that may require further investment by carriers in infrastructure to provide seamless coverage. 3G technology operates at higher radio frequencies than earliest 2G systems and does not penetrate inside buildings as effectively. Voice quality may suffer and data rates are often much reduced.
DeadCellZones.com has launched a coverage complaint map that is optimized on the iPhone to when you are away from your computer. https://iphone.deadcellzones.com Type in your zip code, city and address to search for other complaints in the area. Add your comments on the coverage problem whether you are indoors and the type of device you are using to help carriers better understand how to solve the problems in the neighborhood.