http://en.wikipedia.org/wiki/GSM
http://en.wikipedia.org/wiki/GSM_frequency_ranges
GSM quad band phones use 850, 900, 1800 and 1900 frequencies. I had a tri-band European phone but it sucked because it could only get 1800 and 1900, and the lower frequencies go through more stuff so get better reception.
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Uncertainty is an uncomfortable position.
But certainty is an absurd one.
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