We are unable to send out data overage notifications via text message however we do send an email notification once you have used 80% of your data. We also send an email notification for every 1GB you go over your data cap.  
 
Reminder – each GB that you go over your monthly allowance is charged at $1 
 
We do recommend logging into your online account portal which will allow you to view your usage and upgrade your plan at any time