I have about 10 pqas and they all work. Most are from way back when I first got my 6035, so a few years. I would imagine as more and more smartphones have better browsers, faster connections you will see less of them.

Which ones do not work?

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My sordid past:

Kyocera 6035, Kyocera 7135, Samsung i700, iPAQ 6315, iPAQ hx4705, Motorola a630, BB 7100t, iPAQ rx3115, JAM 850, BB 8700g, Samsung i320 (just for fun), imate KJAM, TMO SDA, MDA, TMO Wing