From WengoWiki

Where can I create a client account?

You can create your account online on the http://www.wengo.com website.

We will guide you to create your account through the following steps :

• contact details form
• payment method form (credit card)
• choice of your nickname and confidential code

This client account is associated to your Wengo account, this means that when you logon your WengoPhone you automatically have access to the Wengo services :

• I connect my WengoPhone with my Wengo identifiers
• I click on the Call Me button of a service provider of my choice
• Your Wengo nickname is shown to the service provider
• The transaction is billed to your default credit card