How do you show your driver's license to a government official without exposing everything else on your phone, especially to the police? From a US perspective, using one's phone as an ID seems incredibly risky.
You have to carry a licence when driving here in NZ but in the 10-15 years I haven’t carried a wallet I haven’t carried it. I’m not 100% on how it will go if I need it while driving (potential US$200 fine). It’s not needed for domestic flights or anything really.