How to ask phone number from the Invitee?

There are two ways to get phone number from Invitee.
Get the phone as an additional information from the invitee.
You can use event type questions section for this.
Check out How to ask phone number of the invitee using questions?

Set the meeting location as Phone call and select the 'I will call my invitee' option.
In this case, your meeting itself is through the phone (Similar to Zoom, Google Meet).
Check out How to setup phone call as meeting location?
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