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, including Tucson, AT&T ...

Everybody knows that using cellphones indoors can be a mixed bag: you might get lots of signal strength outside (standing in the rain) but once you step inside (where it might be, say, warm and dry) ...