My Android ICS phone has 42MB available (according to Settings->Storage). I am not able to install some new apps (e.g. O2 wifi, size 4MB) or update some existing apps (e.g. TouchPal X, size 19MB) though I have been able to install other small ones (e.g. Terminal Emulator, size 1MB and Cache Clear 5MB). I've tried using Cache Clear to clear the caches. I've tried 'pm set-install-location 2' to default the install location to external storage (currently it's 0 i.e. auto) but it's rejected it with the comment 'killed'. I've moved all the apps (that I'm allowed to move) to the sdcard. I'm not able to root the phone (ZTE V790) as I haven't found any instructions & software that works. I'm at a loss what to do.