A few weeks ago I was on the 25th floor of the Renaissance Parc 55 hotel in SF, standing by the window. I had a full-stength signal (according to the phone meter) on my Sprint PCS phone. But it would often take 3 attempts to make a call, and when I had a connection quite often I'd lose the call somewhere in the middle.
I don't have problems like this around DC - if I have a strong signal, I have no trouble with dropped or unconnected calls.
Something's mighty messed up out there in the cell phone towers/etc....
Cheers,
Scott.