The problem and controversy with this is that AT&T is asking its customers to fork out $150 to patch problems in their network coverage. To most of us, this seems insane. It's up to a carrier to maintain and improve a cell network, not to its customers. Nevertheless, the device will probably sell very well, since a lot of iPhone users want to use their iPhones exclusively, foregoing a landline completely. If AT&T's spotty coverage makes this impossible, then MicroCell is for you. It's currently available only in Charlotte, North Carolina, but we believe that it will be released nation-wide pretty soon. It's similar to Sprint's AIRAVE.The device will work with your existing cell phone minutes. If you have your phone (via VOIP or a landline) or internet with AT&T, then you get unlimited calls to your cell phone for $10 a month. If you have both, it's free. Otherwise, you'll have to pay an extra $20 a month for unlimited calls. However, you do get a $100 mail-in rebate in the last case, which brings down the cost of the device to $50. Check out Jason Nash's review.
If you have spotty network coverage in your home and you've been wanting to use you iPhone exclusively, then this might be a great option, especially if you already have two of AT&T's services. That way, you don't have to pay anything extra and you get unlimited calls.