Comparison - Doro Secure 580 and Doro Secure 580 IUP. What is IUP?. Assistance button to make you feel safe and secure. Visual ring indicator. 3G: Yes - 3G (Bands): UMTS Band 1 (2100) & 8 (900). Hearing aid compatible: T3/M3 (GSM), T4/M4 (3G).
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