The Galaxy Z Fold 8's fingerprint scannerAnd why it's just so usefulCloseThe Samsung Galaxy Z Fold 8, as well as the Ultra model which I've also been using, has a side-mounted fingerprint scanner on the right edge. Like many side scanners I've used, it's built into the power button. An old-school way of doing thingsWhy side-mounted scanners are so rareI understand why side-mounted fingerprint scanners aren't still commonplace, even if I have fond memories of them. When I began reviewing smartphones, under-display scanners were new on the market, and side ones were still commonplace. This would be one of many possible workarounds for how unreliable under-display scanners can be.