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| A '''dual-mode handset''' is a flexible [[worn device]] that connects to more than one [[wireless]] [[base station]], typically a [[cordless]] and [[cell]] combination. The [[DECT]]/[[GSM]] combination is expected to be particularly powerful, as it will enable broad coverage via GSM and extremely high quality audio, data, and enhanced services via DECT (where that coverage is available). | | A '''dual-mode handset''' is a flexible [[worn device]] that connects to more than one [[wireless]] [[base station]], typically a [[cordless]] and [[cell]] combination. The [[DECT]]/[[GSM]] combination is expected to be particularly powerful, as it will enable broad coverage via GSM and extremely high quality audio, data, and enhanced services via DECT (where that coverage is available). |
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| Such handsets should only be carried in the hand to "dial" (i.e. use the [[touchtone]] interface), the [[headset]] should be assumed to be in use at all other times.
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| === audio configuration ===
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| Existing [[cell]] and [[cordless]] handsets have lousy audio and so typically only require a 1.5mm stereo jack.
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| A [[DECT]] connection has sufficiently high quality [[audio]] to be effectively equivalent to an [[FM radio]], so headset quality would be about the same as a typical [[walkman]], with a microphone good enough for [[MP3]].
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| This suggests that a 2.5mm stereo headset jack would be part of the set, and might switch between receiving left and right channels of FM stereo, or receiving high-quality mono and sending (via microphone) high-quality mono. Or, it might have two separate stereo jacks the way [[laptop]]s and [[PDA]]s do, and support for full stereo sound, and full stereo (two source) input.
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| In any case, no physical disconnection or switching would be required to shift modes. In a combined DECT/GSM network, the [[handover]] is also seamless - it is only [[billing]] that indicates the difference between which nets are used.
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