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Tri-band refers to a handset that can
work on all three GSM frequencies. These are:
GSM 900 (BT Cellnet, Vodafone and most
networks around the world)
GSM 1800 (Orange, T-Mobile and some of
the European networks)
GSM 1900 (Used in USA and Canada)
A SIM Free tri-band phone will work on
any GSM network in the world. A tri-band handset that is connected to a line with roaming, will
work on all countries that have roaming agreements with that network.
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