The game ran fine until 0.8.0 was released, there were never any crashes till that version was put out (which ultimately resulted in 0.8.2 that supposedly alleviated some of the crashing). I'm using the exact same phone and can play 0.75.2 without fail and issue, but as soon as newer versions are loaded, there are frequent crashes.
So I don't believe it is exclusively a ram or phone problem. Something got added or done along the way in version 0.8.0 that hasn't been addressed or corrected yet.