The waitlist form is a completely separate form which collects minimal details for the contact to place them on a waitlist, it does not use any of the registration form settings/fields set in EE normally.
However, you can use a snippet like this to add a phone field:
The support post ‘wait list registration field edit and change default ticket type’ is closed to new replies.
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Support forum for Event Espresso 3 and Event Espresso 4.