This works very well. My house gets terrible cell reception, no matter the carrier. I had a zboost wireless extender, which worked but only within about a 30ft radius of the base unit and was much more difficult to install than this unit. I was reluctant to spend yet even more money to get a usable cell signal in my house, but AT&T gave me a very nice offer to get one of these units, and it works extremely well. It transmits your cell signal through your internet connection, rather than relying on boosting an existing weak cell signal. I now get 4 to 5 bars throughout my 2 story house. You can tell your phone is connected to the unit because your phone's display of the carrier changes from "AT&T" to "AT&T M-Cell." Some limitations are that it only works for AT&T 3G phones, and you have to add each phone you will use via AT&T's website to work with the unit during set up, up to 10 phones total. The unit isn't particularly attractive, especially the orange "cell bar display" on the sides, but it seems very well built, markings indicating it is made by Cisco. Bottom line--it works well! No more dropped calls at home, and I can finally use my cell phone reliably in my house.