what is the phone icon in the upper right corner of my iPhone 7?

I

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There is an icon in the upper right corner of my iPhone 7. It is a telephone handset sitting on top of some dots. I am trying to cinq my phone to my hearing aids, and following all the steps, but it still doesn't work. I think whatever this is may be the cause but I can find no explanation online of what this icon is tied to.
 

John Yester

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May 23, 2012
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Here ya go. Looks like TTY
 

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