Thank you very much for you answer.
When editing the CF7 code should I use the name or the tag of the field in order to send the value of the form to my Mailchimp list?
It seem the tah is what should follow the mc4wp- but I still have doubts for the I value show you in bold in the following example:
<label for=“?Field Name?”>Teléfono</label><br />
[tel* mc4wp-PHONE]
Thank you very much,