With regard to the design of smart phones, every millimeter of space saved is a small victory that can allow the use of a thinner enclosure, the shrinking of a larger capacity battery, or the inclusion of other innovative technologies

In the past, switching from standard SIM cards to Micro SIM and then Nano SIM has provided enough flexibility to place the card slot in a convenient location that does not get into the battery space or other essential electronic components. But the tendencies towards a sleeker construction have come to force the physical limits again, some elements that can not be miniaturized (eg 3.5 mm jack connector for headphones) are eliminated. The next impediment is even the SIM card slot.

Affordable for unidirectional case phones with a slot applied to the side frame, the SIM card slot is a weak point for structural strength of the case, its area being the first to suffer distortions in the event of improper handling .

The ARM chipset maker solves these issues by integrating the SIM card functionality directly into the chipsets of mobile phones. Thus, from a 12.3x8.8 mm size of a Nano SIM card (including the slot that holds it), the footprint can be reduced to only "a fraction of mm²" occupied on the surface of a silicon chip. The measure will reduce the cost of manufacturing and will free up space for other purposes.

Named iSIM, the new SIM card format must first be approved by mobile phone companies, but there are not many reasons why they refuse, as the new miniaturized format is also applicable to IoT (internet of things) devices, which will increase considerably the number of devices present in the network

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