If you ever use more minutes, text or data than you expected you can always add Top Ups. You can add Talk, Text or Data Top Ups by going to your Dashboard, clicking on the line you want to add Top Ups to and then clicking Add More under the line usage overview . Choose the add on amount of minutes, messages, or data, then click Buy Addons, followed by Confirmation.
There are no fees for adding Top Ups to your account, nor is there any limit to the number of times you can add Top Ups in a billing cycle. What’s more, these Top Ups are eligible for rollover, as described here.