The smartphone industry is starting to omit the USB cable from new phone boxes, led by models like the Sony Xperia 10 VII.
Try a DIY method like inserting steel wool or a rubber band between the screw head and your screwdriver. Or invest in a screw extractor set.
Most smartphones have a tiny hole at the bottom of them but it's not always clear what it's for. Here's what that hole is for and what it does.