We've previously written about AT&T's MicroCell device and service here at TUAW. It's a tiny cell tower that you plug into your home cable or DSL connection to boost your phone reception. This is particularly handy for those with home offices who may currently be plagued with poor reception on their iPhones.
WMExperts is reporting that AT&T is adding five more markets to the short list of trial areas. If you live in Georgia, North Carolina, South Carolina, Las Vegas, or San Diego, you can have the opportunity to spend an additional US$19.99 per month on top of your existing iPhone service plan to get 5 bar service in an area up to 5,000 square feet around your MicroCell.
To determine whether or not you're currently in one of the target zones for the service, visit the AT&T 3G MicroCell website and enter your zip code into the appropriate spot. If you're one of the lucky ones, a list of retail locations where you can purchase the MicroCell will appear. You'll also have to pony up $150 for the device in addition to the monthly charge, but for those who really need perfect 3G phone service in their homes or offices, it's worth the cost.