For a description of Tariffs refer to What is a Tariff?
SIM Tariffs are displayed in the Tariff Info column on the SIM List.
You can click on the Tariff to view usage and allowance information. See How do I display Data Usage against Allowance?.
In the SIM List you can view the total data usage for the SIMs that meet the current filter. See How do I view the total data usage for filtered SIMs?
Tariffs can also be used in Advanced Filters.
Note: Tariffs are not displayed for SIMs which have been purchased before 19th December 2016. They are only available for direct customers.