I was always perplexed why AMD pulled out of mobile.
Intel couldn't compete against ARM on the mobile side, so I don't know why AMD didn't just take its ARM licenses and start churning out SoC's for the HTC, LG, SONY, Motorola etc etc of yesteryear.

We know that Apple with its Ax chips, and Samsung with its Exynos chips, were quite competitive from the get-go.

It left the rest to squander with Texas Imaging or Qualcomm, which were both weak offerings. nVidia also ran fine until they lost their target and started making chips for tablets, and not phones (Tegra3 was quite inefficient). TI had financial problems and pulled out of the market. Qualcomm decided to do its own thing, which wasn't smart until they landed the Krait S4 architecture and doubled it with LTE compatibility.

Seems really like a good guys finish last scenario.
AMD chips = out
Sharp displays = out
Palm hardware = out
MeeGo OS = out

Today a large percentage of phones have Android OS, Qualcomm chips, JDI display and most likely a Samsung badge.