Currently we do not send out an invoice for each month. You can check your invoices online by logging into your account at PhoneTag.com. Login using your e-mail address and the pin you created at signup. Once you are in your account you can click the "Account Settings" tab followed by the "Billing" tab below to view your invoices.
If this is a special case where your business will not allow you to have PhoneTag without a hardcopy monthly invoice, please contact support at email@example.com or 800.788.0916 and we will try and assist you.