My iPhone 4 picked up my signal immediately. While it is frustrating to pay for a $150 device to get a cell signal in my home, ATT can't help the old thick plaster walls or if some residents won't let them install another cell phone tower. I have a feeling that my thick walls and a bottom floor apartment next to other buildings doesn't help. However, the Microcell did manage to get a GPS lock near a window and I have had it since last Wed and was working with my 3 G fine. Still not absolutely the clearest connection, but that is probably more due to my bluetooth headset. I picked up an iPhone 4 at ATT and they activated it at sore. When I walked in my apartment, I had wifi enabled and it immediately saw my Microcell and started working.