No worries! At Twigby, we won't charge you any outrageous overage fees for using more data than you have on your plan!
If you use more data than your plan, you will simply move up to the next data tier and be charged the difference between them (no extra fee). If you are already at the 4GB plan, once you use 4GB, your data will be slowed down to 2G speeds.
If you do not want your plan to change, you can turn on Overage Protection (click the link to learn more about it). With this, you will still be able to access data when you hit your limit, but at 2G speeds.