I have an iPhone4 and use it for business calls at my small office building. The address is 3400 E 3rd Ave, Foster City, CA. I am frustrated receiving the occasional call from my co-worker or family only to know that the call will drop even on these clear sunny skies and very few folliage/trees to block the signal (where it comes from I don't know). I get 3-bars as best and that strength isn't good to prevent calls dropping all the time. It seems our one story building isn't a problem but maybe the 250k transmission power 100-yards West of my office position. Note: I used to have AT&T and had no problem.
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