Widex C-9 - Manual (Page 38)

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Phone+
If your hearing aid is programmed with Phone+ instead of Zen+,
this program is accessed via a long press (more than 1 second) on
the program button on the hearing aid .
You can exit Phone+ by pressing and holding the same program
button for more than 1 second .
If you wish to have the program button disabled, please consult
your hearing care professional .