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Battery life issue: reading device can read data from a dead phone, or the core of the data must be always alive by a special battery
David Birch proposes an idea of using phone for personal identification without revealing real name. The issue is the battery life of the phone. If the phone goes dead, it's unable to identify yourself, or even buy a phone charger...
Solution: The reading device must be able to read data from a dead phone. Or the core of the data must be always alive by a special battery (say a few years span live).
Sina Elli 10+