Samsung Instinct HD
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Replying to: Half Duplex Speakerphone??? by spellicano
True full-duplex speakerphones are somewhat rare in cell phones. It requires relatively sophisticated sound processing to prevent feedback. Most speakerphones in cell phones are half-duplex, but most do a good enough job detecting who's speaking - and switching quickly - that you wouldn't notice. Really, most people would be surprised to learn that their phone's speakerphone is technically half-duplex.
It's only if you have a group of people gathered around a phone using it to have a conference call meeting that you really need full-duplex. Most people don't do that with their phones.
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