You can easily top-up your traffic via the dashboard. As soon as you use 50% of your traffic, an Add more traffic button will appear under the Overview section of the dashboard. Press it and choose the amount of traffic you’d like to add.
Here’s how much additional traffic you can get depending on your plan:
Micro: 5GB or 10GB
Starter: 5GB, 10GB or 25GB
Advanced: 5GB, 10GB, 25GB, or 50GB
Venture: 5GB, 10GB, 25GB, 50GB, or 100GB
Business: 5GB, 10GB, 25GB, 50GB, 100GB or 200GB
Corporate 5GB, 10GB, 25GB, 50GB, 100GB, 200GB or 500GB