I live in downtown Boston and I can rarely use my iPhone 3G in my apartment. I have never gotten a 3G signal inside my apartment and EDGE is either 1 bar or "No Service." If I can make a call it's frequently dropped. I just had my iPhone replaced for an unrelated issue and I had hoped that it was just a problem with the phone. It's not. When I called AT&T they said that my area should have full 3G coverage and recommended I get the SIM card replaced. I went to the nearest AT&T store and explained the situation to the guy there. He told me a SIM card wouldn't fix my problems. "AT&T doesn't work inside buildings. Sorry." Uh, excuse me? I asked him why anyone in their right mind would choose a company that doesn't work inside. He said that their signal isn't as good as penetrating through buildings as other carriers and that smartphones like the iPhone and Blackberry use a different signal which is even worse at penetration. This is absolutely ridiculous. I'm still within the first 30 days of my AT&T contract so I might cancel it but that's such a pain in the ass and I'm in love with this phone... when it works. My roommates all have Verizon and their phones work fine.