Tri-band means 3 bands and quad-band means 4 bands.
The band relates to the different frequencies used to deliver signal to your phone in different areas of the world.
A major difference is that a mobile phone will work better using quad band in the US. Some larger cities cover all frequencies, though with Tri-band you may struggle to get a signal in smaller towns.
Countries/Continents that use the various bands are as below:
- 850 MHz - U.S./Canada/Latin America/Brazil
- 900 MHz - Africa/Europe/Brazil/Australia/Asia ex Japan and S. Korea
- 1800 MHz - Africa/Europe/Brazil/Australia/Asia)
- 1900 MHz - U.S./Canada/Latin America/Brazil
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