I have found that in rural America, Samsung, HTC, and LG seenot to work where other phones will. This is regardless of carrier and gsm or cdma network. But rathet if a tower is near or far from you. I have tested this with both 1900 and 850Mhz frequencies. Most phones will not even give u enough coverage to even dial 911. The exceptions seem to be with Motorola and Blackberry phones. My testing was done in extreme rural California, Idaho, Nevada, Wyoming, and Utah. Does anyone else have different results?
I used to see this a lot when I had T-Mobile (considering they use high frequency networks at 1900MHz and 1700/2100MHz) and I live/study/work/commute in a rural part of Central California. My family had a terrible time with Samsung phones and I also had a terrible time with HTC (the Nexus One, especially). They would easily lose a weak signal when they were relying on only one tower. In those areas, I had solid performance with Sony Ericsson, Motorola, and Nokia smartphones.