AT&T put up a nice little page detailing everything about their upcoming 3G mini cellphone tower called the MicroCell. It supports any AT&T 3G cellphone like the Bold but not the Curve or 88XX series devices. Unlike the Verizon & Sprint solutions this tower does work with data at 3G speeds but once again ONLY works with 3G so EDGE devices need not apply. This is because 2G GSM signals are hard to setup and manage due to its pulsing signal instead of the continuous 3G signals.
There is sadly no information about price and if it is a subscription but details about the device are plentiful. It can support 4 devices for both data and voice simultaneously and you can lock it down so only you can use it. It works over your DSL or Cable internet connection and you calls are handed over seamlessly from this tower to any other AT&T tower.
via Engadget Mobile