Treo is sold in two versions: a 900/1900 MHz dual-band world phone available in North America and a 900/1800 MHz dual-band phone available in Europe and Asia. The 900/1900 MHz world phone can be used anywhere on GSM 900 networks and in North America on GSM 1900 networks. The 900/1800 MHz phone can be used anywhere on GSM 900 networks and in Europe and Asia on the 1800 network. Note: North America operates on the 1900 GSM frequency only.

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