Logos SIM products are fully compliant with ETSI GSM 11.11, and support SIM Toolkit Applications as specified by ETSI GSM 11.14. OTA functionality is compliant with ETSI GSM 03.48.

To allow third-party development of SIM toolkit applications, Logos offers the LSCript products that include a highly efficient proprietary interpreter on the card.

The LSCript applications are compiled into byte code using the LSCript development kit. The byte code is loaded to the SIM as part of the production process.