For a while eSIM management on Mobile Linux, such as postmarketOS, was just a dream. Now it’s real! Background Nowadays many smartphones and other devices have a so-called eSIM - or eUICC - built-in to the device. This eSIM is essentially a chip on the PCB of the device that allows an end user to download a SIM profile - essentially all the data of a SIM card - to said chip and then the modem of the device can use that chip the same way as it would use any physical SIM card you insert.