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‘I sold my iris; now what?’: What drives Brazilians to hand over their unique, personal data
(advox.globalvoices.org)
This is a most excellent place for technology news and articles.
Nope. Like all biometrical data, you can't just replace the body part once the data is compromised. It's at most suitable for ease of access.
For example, Merkels fingerprints were "reverse-engineered" from photos using common wood glue.
https://www.theregister.com/2014/12/29/german_minister_fingered_as_hackers_steal_her_thumbprint_from_a_photo/
Yup, I use my fingerprint for my phone because it's convenient, but require my pin (6 numbers) on boot, and my phone reboots a couple times each day (after a set time not using it). Anything more important uses a very long password.
So it could restart, you wouldn't know and don't receive calls because you haven't authenticated?
Not OP, but most phones I've used will still allow incoming calls after reboot before being unlocked. You just can't access the apps until you've unlocked.