Here’s how to check data usage on a Galaxy device.
But please be aware that this data usage may not be accurate.
The data usage shown on PhoneBox App/Website is more accurate.
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Prepaid plan
Settings > Connections > Data usage > Mobile data usage > click gear button > Change cycle date according to your service terms
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Monthly plan
Settings > Connections > Data usage > Mobile data usage > click gear button > Change the cycle date to “end of every month”