Space is not a constrain in many flagship phones. Check this comparison of (unofficial specs) s24 vs s8 (0.5mm appart. S8 also had sd card slot) https://m.gsma

Space is not a constrain in many flagship phones. Check this comparison of (unofficial specs) s24 vs s8 (0.5mm appart. S8 also had sd card slot) https://m.gsmarena.com/compare.php3?idPhone1=12773&idPhone2=8161 https://m.gsmarena.com/compare.php3?idPhone1=12773&idPhone2=... This is the datasheet of a generic 3.5mm It is thinner than that: 3.2mm. https://www.cuidevices.com/product/resource/sp-3530.pdf https://www.cuidevices.com/product/resource/sp-3530.pdf