You can choose to be alerted when the number of message credits left on your account reaches a given threshold.
If the number of credits left on your account has dropped below your given threshold, then an SMS alert will be sent to your registered Mobile number
The Low Credits Alert threshold can be set from the “Low Balance Alert” option of Account Overview Panel.
A setting of 0 (zero) in this field turns off this function, and you will not be alerted when your number of credits reaches 0 (zero).
Please note that if you choose to be alerted by SMS, then any SMS messages sent will be charged to your account.