Enabling Auto-Refill is the best way to make sure you don't experience any balance related service interruptions. Follow these steps to set it up and forget about having to ever manually reload your account.
1) In your Dashboard navigate to the Billing page by clicking on the User Initial Icon on the top left-hand corner. You can also click here to go to that page.
2) Once in the Billing page make sure there is a valid payment method on file under Billing Overview.
3) Enable Auto-Refill by checking the box in the Auto Refill section.
The settings in the Auto-Refill section allow you to change how much to add to your account and when to add it. This varies from use case to use case, but a popular choice is to add enough balance to cover your organization for a full month to reduce the amount of charges to your credit card to about one a month.
Enabling Auto-Refill on activation
Alternatively you can also enable Auto-Refill in Step 3 of the SIM activation process.
Note: Billing settings are set at the organization level