U.S. iPhone users have joked that Apple’s gadget can do everything but make phone calls. The problem is partly due to congestion on AT&T’s wireless network.

Now in some cities, AT&T is selling a way to fix the problem a $150 mini cell tower for the home called the 3G MicroCell. The MicroCell routes calls over a high-speed internet connection and gives iPhone owners and anyone else with an AT&T “3G” phone flawless reception at home. The problem is, unless you pay an extra fee each month, you’ll still be using minutes from your cell phone plan to make calls that aren’t really taxing AT&T’s cellular network. That just doesn’t seem fair.