Thanks, guys, good to know at least one works.
I mentioned memory bus size because as you may be aware, there have previously been well-documented issues in PC's that cannot address hard drives over a certain size--regardless of format--because they have or need 48(?) bits on the address lines to count "that" high, and previously they had only 32. Or maybe it was 48 they had and they needed 64...the exact numbers don't matter. The point is, the OS and the hardware controllers (and there is a controller for the SD card) all need to be able to count "that high" in order to read all of the memory. For varying reasons of ignorance or economy, all of them don't.
In fact, I still have an Atrix that counts very nicely to 64GB, but won't accept one Byte more, no matter who or how the car is formatted. Which is one reason it got replaced.
Similarly, there are the Fiio high-resolution digital music players. Incredible sound quality, they make the best smartphones sound like a 1960's 4-transistor AM radio. But, they take a 128GB memory card, maximum. And any number of car stereos, again, have odd limits from 32GB on SDHD cards, six years after SDHC was obsoleted by SDXC. The newer ones? Well, let's just say that none of them has claimed to be able to work with the multi-terabyte limits that SDXC provides for.
Phone makers tend to forget to mention inconvenient things. Like Samsung, who don't tell you their phones will light up and beep in the middle of the night so you can stop charging them. (Hey, at 3AM I don't give a damn, I need my sleep.) Or LG, where if the phone is charging, has reached 100%, and you want to power it down and unplug the charger? It will power down AND THEN POWER UP AGAIN with a black screen, so that by morning it has only 1/2 charge left on it. Pulling out the charger cable apparently turns the phone on, during a power-off cycle.
Last time I met a "phone" I could trust, it was a black rotary dial Western Electric 500 series. And, btw, the FCC tells us that "cell phones" are computers and radios, but they are NOT TELEPHONES. Under federal law. Maybe if Western Electric made a cell phone, it would just work as promised?