Hi AGH1,
You can check your Data usage by logging into your Telstra My Account..then selecting the Pre-Paid Data service.
https://www.my.telstra.com.au/myaccount/home
You can also check your Data usage in the My Telstra App.
Press on the "Services" tab (2nd icon at the bottom of the screen)
If your Pre-Paid Data service is in the App press on the service then under "More with your service" press on "Usage History".
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Hello