Hi, just got my 9210 
tried to run doom on it and it keeps telling me i'm lacking memory. How do i increase the memory then? I've tried unistalling all the programs i think i don't need..i even unistalled this ASheet Font or something but it only unistalled partially because it said it was in use (am i going to regret this later on?)...anyways...is there really now way to free some more memory? I think the rest of the installed programs are needed such as word, sheet, etc.
9210 lacking memory for doom
Get a program called switcher that lets you close running programs. Otherwise the simplest option is to reboot the phone before you want to play and you should have enough free memory to do so.
TaskManager is also a good application to close the unnecessary applications.
After a reboot you should have enough memory to run Doom. You could also use the apps mentioned above or the new doom laucher which has an "free memory" function. But all the apps I found were non freeware 
So I just use SHIFT+CTRL+CHR+K to kill apps in memory Just don't kill the TELEPHONE app 