I think the Sony Xperia phones was one of the big proponents of this, where the fingerprint scanner is on the side, integrated into the power button. I never had an Xperia phone but I always thought this was a good idea compared to having it on the back or having it where the home button would be, since when you pick up the phone, your finger should naturally rest on the power button (assuming it’s thoughtfully laid out), and you can also use it when the phone is lying flat on a table, which you can’t do with it on the back.

I know some people are worried about privacy since then you need to use the fingerprint scanner if you want to use the phone, but those people will probably want to buy a non-Android Linux phone like the PinePhone or Librem anyway, and if those get a fingerprint scanner in the future, it will probably have a physical switch that disconnects it electrically, like they do for the cameras.

Personally, I like them over the more common back of the phone location or even the newer under-screen ones, and never under understood why they didn’t take off, but what do you think?

@AgreeableLandscape
admin
creator
6
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4M

Actually, I just thought of this drawback: payment, in-app purchases, opening password managers, etc now use the fingerprint scanner for authentication. If an app is asking you to authenticate, and you go to turn your phone off with the power button, you could accidentally authenticate when you didn’t mean to, which is a security risk.

Ephera
24M

I mean, nowhere on a phone is safe enough from unintentionally putting your finger in that place. So, a fingerprint shouldn’t be used as the only confirmation for anything with consequences. There should at least be a confirmation dialog or something like that as well.

@AgreeableLandscape
admin
creator
14M

Good point. It could easily be solved by the OS just asking you to confirm after scanning your fingerprint.

PMFL
34M

From a LG user i use it all the time, i like it. The only dowside is turning off the phone. Sometimes it tinks i want to unlock not to turn off.

@AgreeableLandscape
admin
creator
24M

I had an idea for this but I’m not sure if any phone manufacturers use it. Place your finger on the scanner to authenticate, and then click the button to unlock. For turning off, I feel that simply pressing and holding should bring up the shutdown menu instead of unlocking.

PMFL
24M

Lg V10, V20 is like that and G6 was also like that. My V50 it’s just for unlocking the rear fingerprint sensor. The power it’s a seperate button. Press and old it’s ok, but the software was to be spot on because on my work phone the V20, press and old nothing, press and hold unlock, press and old again and it goes to the restart, shutdown menu… It’s a pain sometimes.

@Axaoe
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They make a lot of sense and are really nice to use for the most part unless you’re left handed (then you’ll want to scan a different finger/hold the phone a bit differently).

The S10e had one as well and worked quite well, I like them about as much as the rear mounted scanner placement and prefer both to front mounted scanners.

Pine64 is working on a scanner backcover for the PinePhone too, pretty neat addition imo -

teddit.net/r/PINE64official/comments/l40esv/fingerprint_scanner_update_the_new_prototype_is/

Ephera
24M

I could imagine that phone cases are difficult to manufacture with the fingerprint scanner on the power button.

You would need a hole in the case for the fingerprint and then have it big enough, so that you can actually still push the power button.

@onek
14M

sony xperia phones were great for this before wifi calling and volte came out - really miss this feature. unfortunately xperia phones in US markets don’t support features like wifi calling, volte, or even the f’in fingerprint scanner anymore. fail.

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