Have the Blackberry Tour and noticed that the phone has a problem holding a signal - even when you are in a strong signal area. If you watch the signal strenght indicator, it keeps fluctuating from 1X to 1XEV and from 1 to 4 bars of signal. Also while in Europe and using international access, this was also the case and I often was unable to answer the phone when I received a call. It would just disconnect. Although while international, I was able to place calls without a problem.