Question: what is the difference between dual band and quad band phones?
Answer: In America two bands (850/1900 MHz) are used in the same country to improve coverage. Dual band phones are also used to enable roaming between different countries. ... A quad-band phone allows you to roam almost anywhere globally. It covers the 850 Mhz, 900 MHz, 1800 MHz and 1900 MHz frequency ranges.