[1][4][6] From release 4 onwards, GSM 11.14 was replaced by 3GPP TS 31.111 which also includes the specifications of the USIM Application Toolkit for 3/4G networks.
As of October 2010[update], mobile network operators can, for example, deliver updated STK application menus by sending a secure SMS to handsets that include a Toolbox (S@T) compliant wireless internet browser (WIB).
It might also be possible to change the menu of STK applications based on the Wireless Internet Gateway (WIG) specification.
[8] If a mobile phone does not support SIM Application Toolkit, users may not be able to use the service or network correctly.
Issues with several mobile network operators have been noticed on smartphones that don't support STK, like Nokia N900.