If you're concerned about how much data you're using, there are a few things you can do to lower your usage. One thing you can do is change the way you use apps that use a lot of data. For example, if you're streaming music or video, try downloading it instead. That way, you can listen or watch without using data.
You can also adjust your phone's settings so that it uses less data. For instance, you can turn off automatic app updates and background refreshing. And if you have a limited data plan, make sure to set a limit so that your phone will warn you when you're getting close to your limit.
Finally, keep an eye on your apps and track which ones are using the most data. If there are any that seem to be hogs, consider deleting them or finding alternatives that use less data. By following these tips, you should be able to lower your data usage and save money on your monthly bill.