The easiest way to access the ClubHouse is to get invited by a friend who already has a Clubhouse account. Generaly users receive 2 invites. As long as your friend has your phone number, they can send you an invite to download the app with that phone number.
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Once you create a Clubhouse account, you will receive two invitations that you can share with your contacts to invite them to join the app (you will earn more invitations as you host rooms and participate in chats)