This page says that it would only bill as a text... Anyone know for sure?
Many cellular carriers assign email addresses to cellular phone numbers and support SMS or text messaging by email. You don't need to install special add-ins in Outlook to send text messages, but the recipient will need text messaging enabled on their cellular plan (most carriers enable it by default) and have a phone capable of receiving text messages (most new phones are text-capable).
To use, compose a short email message using less than 160 total characters in Outlook (or any email client) and address it to the cellular number at the carrier's email domain. Remember to remove your signature from the message before sending. Note that some carriers will break apart larger messages into 160 character messages, others will deliver only the first 160 characters.
The phones only support plain text messages but the carriers strip multipart HTML, so you don't need to remember to switch to plain text format.
Email sent to cell phones is billed to the subscriber as a text message.
The major US cellular carriers use the
format for SMS to text capable cell phones, with a limit of 160 characters in the subject and message body (total).
Carrier Send Email to phonenumber@....