Were you stressing the memory at all on the Nokia 770? If you weren't actually using any of the swap space on the swap file, you could get away with unplugging the swap without crashing the system, until the kernel decided it wanted to use swap, in which case it might crash. Heck, even if you were using some of the swap space, you might still survive until you actually performed an action on the 770 that caused a swap read or write.