Ever since the advent of the personal computer, people have looked to them for entertainment just as much as for business use. This holds true to this day, and portable devices are no exceptions. When the work is done, here are a few iPhone games that will provide hours of fun and won't cost you a cent.
Sol Free Solitaire (Smallware) - One of the ultimate time killers ever to come to computers, it's only natural that it would come to the iPhone. Sol Free Solitaire contains five games in one: Klondike Deal 1, Klondike Deal 3, Baker's Game, Demon and Spiderette. The perfect, age old way to pass a little or a lot of time.
Bejeweled (PopCap Games) - One of the most popular games ever created by PopCap Games, Bejeweled is a simple puzzle game that's fun and highly addictive. Match three or more jewels of different colors and shapes by swapping two at a time to clear them from the board. Creating combos by matches falling into place creates special gems that can clear several around itself or clear all of one color from the board.
TapTap Revenge (Tapulous) - Rhythm games like Rock Band and Guitar Hero have become very popular lately. Many software companies look to create similar games to provide a variety of choices. TapTap Revenge is one such game. Catch the falling arrows synced to its own music by tapping the screen or shaking the iPhone from side to side. Also includes a two player mode to compete with your friends.
Duck Hunt (Nintendo) - A classic console game emulated for the iPhone. Tap the screen to fire up to three shots at the duck flying around (two ducks in later rounds) before they fly away. Ten ducks advances you to the next round, which start flying faster. A great game for coordination or a bit of nostalgia (stop laughing at me, dog!).
The Battle for Orion's Belt (Cellufun) - A unique game out of the bunch, The Battle for Orion's Belt is a top-down action game that pits your spaceship against others in an engaging story where you rise from the ranks and eventually command a squadron of your own. Upgradeable ships, customizable controls and unlocked trophies will have you coming back again and again to put your top score in the game's community.
Of course, this list only scratches the surface of the available free mobile phone games for the iPhone. There are literally hundreds of games in every genre imaginable: sports, action, adventure, card games, board games, pet simulators and some which defy all categories. Quite a few of them won't cost you a cent, but you should always be careful. Sometimes you really do get what you pay for. But these are few and far between. For every game that feels like it was thrown together in an afternoon, there's another that has an unexpected amount of detail and work put into it. With enough time, you're sure to find games that you'll play over and over again.