To avoid having problems because of low balance for outbound calls, you can allow Toky to charge automatically your balance with some money when it goes to some specific amount.
To do this you can follow these steps:
Go to Toky's Dashboard
Below the Current Balance panel click on Notifications & Auto-Recharge
Check Credit Auto-Recharge
Enter the amount to automatically add to your balance and the lower limit of balance to execute the recharge.
Click on Confirm button
You must have a credit card registered in Toky to execute this option.