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By building in TTY functions into today’s cellphones, it would be possible to call 9-1-1 without separate TTY.
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But this is not required and has not happened due to lack of market.
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Probably the shortest path to nationwide 9-1-1 accessibility using current technology
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Will be good for 10 years, depending on location
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Does not require phased implementation as PSAPs already have TTY
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