android - Using phone's unique device identification number instead of account -


i have idea mobile app not use traditional account account username , password. instead use device's unique identification number anonymous account.

i have questions.

i have never developed mobile device before possible unique identification number on platforms ios , android?

can assume devices in world have unique identification number , nobody change theirs similar other number?

will there legal or technical ramifications using identification number instead of old-fashioned way of using account username , password?

it possible unique identification number on platforms ios , android?

yes, it's possible uniquely identify device installation. refer this article starting point

can assume devices in world have unique identification number , nobody change theirs similar other number?

no. there's no such thing super-unique-id-which-is-used-in-all-devices-in-the-world. although each mobile phone has it's unique id (imei, meid, or esn), it's not guaranteed unique in real world, since can changed. there other devices, not have telephony hardware (for example, tablets), don't have imei. different number should used identify such devices.

will there legal or technical ramifications using identification number instead of old-fashioned way of using account username , password?

no, don't think so. device number not private property, hidden everyone

in general, identifying user device id bad approach , has no practical implementation. why think it's still not used everywhere? couple of point ruin everything:

  1. user changes device (buys new one)
  2. user sells device (new owner)
  3. user has multiple devices

and, of cource,

  1. users device stolen
  2. unique id emulated (or duplicated due collision)

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