Integrated SIM or iSIM is the next generation of eSIM technology, which moves the SIM functionality into a dedicated space on the System on Chip (SoC), protected by a tamper-resistant element (iTRE) or secure enclave. iSIM consumes up to 70% less power than a discrete SIM and is 98% smaller than eSIM, opening up new forms of ultra-power efficient devices unimaginable before.