I tend to agree with the opinion that Biometrics on a phone are just a little over the top and could lead to some problems. The idea that your print would be smeared all over the device, however, is just ludacris. The issues I see arising would be, for example, disabling the phone from being returned to you. Just as it prevents people who would use their phones maliciously it prevents people from trying to find the owner of a found device. I once worked at a movie theater and often we returned found cell phones by calling people on their speed dial and asking whomever picked up to inform the person whose number appeared on their caller id that there phone had been found.
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