From the Settings app, select Wireless & networks.
Navigate to Cellular networks.
Select Cellular networks.
Navigate to Data Usage.
Select Data Usage.
Navigate to Data usage settings.
Select Data usage settings.
Select Monthly date cycle.
Select your preferred billing cycle reset date.
Select Set.
Navigate to Alert.
Select Alert.
Navigate to On.
Select On.
Navigate to Alert size.
Select Alert size.
Enter your preferred data usage warning level.
Select Save.
Navigate to Limit.
Select Limit.
Navigate to On.
Select On.
Select OK.
Navigate to Limit size.
Select Limit size.
Enter your preferred data usage limit.
Select Save.
You've completed the steps!
