No problem! There's no need to send invites to connect with your friends who are already on Voxer. Invites are to invite your friends who haven't joined yet! Sending an SMS invite will only give them a link to download the app.
To find your friends and start Voxing immediately, look them up in the Voxer Directory by full name or email. For more instructions on using the Voxer Directory, check out how on iPhone or Android!