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TCA’s new guidance addresses emerging interoperability considerations presented by the growing adoption of eSIM technology. It provides an analysis of key recent Java Card technology updates, along with the impact of broader ecosystem developments from 3GPP, ETSI and GSMA. A series of best practices and security recommendations are also detailed to maximise interoperability and ensure applet assets are sufficiently protected. For developers seeking practical guidance, recommendations are collated into a comprehensive ‘interoperability checklist’ to help address common challenges and deliver high-quality applets.

Version 1.0 April 2024