I've heard that people with hyperhydrosis have a lot of trouble with biometrics devices as well as smart phones. If your skin is too moist it just kinda gums up the works.
I have a lot of problems with touch screens. Some screens refuse to register my touch, and other screens register my touch before I even make contact with the screen. If you turn on developer tools in android and look at the "touches", you can see them registering all over if I have my fingers a cm or so above the screen.
I have really moist skin, so I wouldn't be surprised if this was the issue. I had a fingerprint reader on my gen 1 Motorola Atrix and that worked just fine though. I think the company that built that authentication system was purchased by Apple and used in the iPhones. I wonder if his wife would have the same issues with his phone, it might be that his fingerprint scanner is less sensitive.
I have really moist skin, so I wouldn't be surprised if this was the issue. I had a fingerprint reader on my gen 1 Motorola Atrix and that worked just fine though. I think the company that built that authentication system was purchased by Apple and used in the iPhones. I wonder if his wife would have the same issues with his phone, it might be that his fingerprint scanner is less sensitive.