USIM Application Toolkit

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Not to be confused with USAT (United States Army Transport)

USIM Application Toolkit (USAT) is the equivalent of STK for 3G networks.[1] USAT enables the USIM to initiate actions which can be used for various value-added services delivered over mobile devices.

USAT takes advantage of the multiapplication environment of 3G devices by not activating until a specific application has been selected, unlike STK which is activated at startup.[2] Some functions are card related rather than application related.[3]

USAT is defined in standard 3GPP 31.111 for 3G.[1]

More information[edit]

For more information see STK, the equivalent of SAT for 2G.