1) It doesn't matter if you're rich and living paycheck to paycheck. This is argument actually supports the idea that UBI won't cause inflation because clearly there is still inefficiencies in market capture if people are rich AND living paycheck to paycheck. (like I said above, inflation doesn't really happen when you don't have full market capture).

2) Selection bias is a thing. While there are rich Americans living paycheck to paycheck, most of the people in this situation are not rich.

3) I'm not sure I'd consider a smartphone an expensive electronic. You can get one for under $100 and a plan that is <$20/mo. This isn't exactly breaking the bank...

4) I also wouldn't call a cell phone a luxury item in today's society. Even a smart phone. You can't get a job without a phone number, which now usually means texting included. A smart phone just means you have a single device that can also get you on the internet. Again, we're talking about a purchase that is well under $1k, has high utility, and is being held onto for years.

Sure, this isn't poor like poor in Africa, but does that really matter? We don't live in Africa. We live in a rich society, I'd like to live in a wealthy society. One where our poorest can get shelter and food. If our definition of poor becomes having constant access to housing, food, health care, and are able to do so on 40hrs/wk, and nothing more, I'd call that a success. But we're clearly not there yet. If we have that, I don't care if someone has a trillion dollars and can buy rocket ships because we're in a post scarcity society (maybe not world, but society).