Lament Island is one of the best phone games ever made. It has wonderful 3D graphics, an excellent soundtrack, an interesting and imaginative plot (with four possible endings), and good gameplay. It also includes innovations such as puzzles which require you to use the phone's microphone and camera.
LI looks and plays a bit like a Chinese Tomb Raider. The emphasis is more on puzzle-solving than combat, but you do also use a pickaxe and catapult at certain points in the game.