How will I know when I'm low or out of texting credits?

Twilio Users

If you have enabled auto-recharge, you will receive an email from Twilio informing you that your balance fell below your agreed amount (as per auto-recharge settings) and that your credit card has been charged.

Plivo Users

When you are in the process of sending a text message or a group of texts, Jackrabbit will include an alert to let you know what your remaining Plivo balance is.