[notpushkin]

Any phone that supports J2ME should do, there's several apps:

https://github.com/kwart/totp-me

https://github.com/baumschubser/hotpants

(Couldn't find one that supports QR codes, though I don't see why that would be hard to implement)

[pjmlp]

I guess there is a business figuring out how to compile out of github into phones for non-techies, specially in the aging population.

[notpushkin]

Hopefully their relatives can remember how to install JAR/JAD apps: https://github.com/baumschubser/hotpants/releases

(Yeah, the UX could be better probably, but hey.)

[pjmlp]

Sure, because everyone has a relative that knows technical stuff, why there is a hiring problem in IT at all.

[notpushkin]

To be honest, you probably don't need to have a CS degree just to remember how you downloaded pirate Java games in early 2000s.

What's your proposed solution again?