Quick update on BREW phones:
-Planning on a huge overview of BREW itself, it's history, and what phones work to get BREW unsigned apps running along with the bounty for the last chapter.
Phones I found to work so far:
Casio G'zone Raving 2: WORKS - (Obviously) Runs BREW games at full-speed, feels great to play, available in mass on ebay, runs off of SD, so no storage limit or need for external programs to load in games. MOST recommended out of every phone.
LG VX8610 (Decoy): WORKS - Works with every game, runs with less frames than C781, Joystick is good, but deceptive as it only allows one direction at a time. Really nice, but expensive, and hard to find. If you have one though, it's a good option.
LG VX8800 (Venus): WORKS - Runs at same speed as Decoy, works with all games, but it has a touchscreen for buttons, which makes it difficult to play some 3D games. Very difficult to find as well, so I can't recommend this one.
LG VX9100 (env2): WORKS - Runs every game I put into it, and this phone is the only phone in landscape that runs BREW. Controls are awkward for games that use numpad, as buttons are on top, but it's currently the only way to play games in landscape. Widely available on Ebay as well, and affordable. Would definitely recommend if you want landscape gameplay, and don't mind the difficult controls.
LG VX9200 (env3): DOESN'T WORK - I tried to install the patched BIN file with the VX9200 DLL from the LG DLL repo, but the program wouldn't recognize it no matter what I tried, even forcing it in to work. I looked up installable MSI versions and other .DLL's for it, and I could only find the same DLL that's part of the DLL repo. I can't get the BIN on it without it, so for now, this option is a no-go. Can't recommend this phone.
LG VX5400: N/A (will test once it arrives, but is stated to only work with 2D games)
LG VX8350: N/A (will test once it arrives, but it should work with everything)
It'll take time to make the video on everything, so it will probably be a while until I update again, but those are my thoughts on ways to play KH in case you wanted to use something other than the C781.