I have kind of rediscovered my Pure Move Dab 2500 recently having put it to one side for about a year and using my phone.
It is really impressive I think and it has a better reception for me in general when walking about than both my EE and Three services (less cutouts, pretty much constant in London except when underground, etc), I think it being a single use device really helps (uses Vodafone network I think) and saves using much data on your phone. Battery still good too, which surprised me, easily get a days almost constant use on Dab.
Anyhow I thought i would get another one and it is pretty much unavailable now except for a few Argos stores, £99 on Amazon, or some refurbs on eBay (not well reviewed).
When I saw how rare they seem to be ti bought a couple as gifts too as I think they are an old device, but a classic.
Anyhow, I have bought all I want to now, so thought I would pass it on Still a few in London at least, especially as it seems to me that it they might be becoming discontinued, possibly (just my guess, as hardly any about).