Yesterday and today, I noticed that my phone service has been wildly erratic. I have AT&T in the USA and I live about 16 miles SW of Denver in Colorado. My guess is that AT&T is scrambling to make all of their necessary upgrades and that they occasionally have "No Service" available at times. This is at my home, where I usually experience 2-3 bars of signal strength--which is more than sufficent for my needs. However, today, I have had 3 dropped calls. Each time when I look at my iPhone, it shows no bars or No Service. Then a few minutes later, the signal strength mostly recovers. I certainly hope this is not going to be a long term situation as AT&T ramps up its 3G service. Has anyone else across the USA experienced anything similar??