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A lot of phones nowadays are lacking a microSD card slot. Although many people find expandable storage useful, some OEMs neglect to include the feature because it takes up precious space that could be filled by “more important” components. Xiaomi, though, might have a solution for this.
Every smartphone is going to need a SIM card slot, so why not have a SIM card that is also a microSD card? That way you don’t need a separate microSD card slot taking up that extra space in your phone.