Each Fax page or SMS text message sent or received consumes one Communication Token from your monthly allowance.
Some of the packages include a monthly allowance of Comm Tokens. If you need to increase your monthly allowance of Tokens, you may do so in quantities of 300.
If you run out of Comm Tokens, then it will not be possible to send SMS text messages or send or receive Faxes. You can monitor your Comm Token usage on your dashboard.