What is the "Attempting HD" icon when placing calls?

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                          I have an HTC One with Sprint, and I recently updated to Android 5.0.2.  After the update, my calls now say "Attempting HD" in the corner.  I tried googling for "attempting hd android", "attempting hd htc one" and "attempting hd sprint" with poor results. What is this?  Can I disable it if I don't want it?

Asked by Eric Grunzke (263 rep)

Feb 12, 2015, 06:56 PM
Last activity: Sep 2, 2016, 05:30 PM

What is the "Attempting HD" icon when placing calls?

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