Good Long Mobile Games?

If you haven't already, get a copy of The Hitchhiker's Guide to the Galaxy.

The Blockheads is a pretty awesome free game, similar idea to Terraria. You can have up to four blockheads in a world, and you grow food for them to eat and build a neat house and all that jazz. Addictive.

I'd also suggest EDGE, Battle Cats (free), Little Inferno.. Also a neat little game that's worth checking out is Nimble Quest, it's like a cross between Snake and a top-down RPG.

I can recommand you Clash of Heroes on iOS, epic game that I never tried to play on computer !

Get Battleheart and Zenonia.

osu!stream is a really good game. I don't know if I'd call it "long," it's a music game (It's an homage to Elite Beat Agents, or it's Japanese version Osu! Tatakae! Ouendan!), but I've played it a lot. It's free to download and it comes with 5 songs, extra packs of four songs cost between $1 and $3.

Also, Telltale has ported most of its more recent games to iOs, and those are pretty good and long.

Hey Tart, if you like puzzle/strategy games like I do: Kingdom Rush, Army of Darkness, GemCraft, Infectonator, SimplePhysics, SteamBirds Survival, Edge, Quell, Aqueduct, Trainyard, Blockwick, EnsoDot, SideFlip, Glow Puzzle, Flow Free, Get Me Out, Doodle Devil, The Heist, iCube, Interlocked, Escapology, Shift, Puzzle Retreat. :)

Angry Birds, Lego HP, Fruit Ninja, Scribblenauts Remix, Contre Jour, Ace Attorney, Worms 2, Reckless Getaway, Dungeon Hunter 2, Galaxy On Fire 2, Infinity Blade 1 and 2, Kof-i 2012, Telltale games, Aquaria, GTA games, Mass Effect Infiltrator, Kingdom Rush, Metal Slug games, Ghost Trick, 轩辕剑贰 DOS怀旧版, Plants vs Zombies, The Bard's Tale, Anomaly HD, RTK Plus, Beat Hazard, World of Goo, Batman, Evertales,Chinese Paladin 1/仙剑奇侠传1 DOS怀旧版, 仙剑奇侠传5 - 剑傲丹枫, 轩辕剑外传 枫之舞 DOS怀旧版, Bastion, Ace Attorney Trilogy, and Crimson Steam Pirates. Oh and maybe 天使帝国1 DOS怀旧版 (Empires of Angels 1 iOS port) as well, but I've never played it on the original system.

For iPhone, get Ghost Trick: Phantom Detective.
For Android, get osu!droid, which is not to be confused with the original osu!, which is made by peppy. The android version is made by Pesets.