iPhone Life - Best Apps, Top Tips, Great Gear

You can check the balance on your AT&T bill or the remaining number of minutes you have directly from your iPhone. From the Home screen, go to Settings >Phone >AT&T Services. Select Check Bill Balance or View My Minutes. AT&T will promptly send you a free SMS with the info.

A scientific calculator was added to the iPhone and iPod touch with versions 2.0 and later of the OS. Among its functions is a random number generator. Press the “Rand” key at the bottom of the screen and Calc displays a random number with 15 decimal places, between 0 and 1. Developers could use this feature to create registration numbers; regular users could use it to create truly random passcodes or passwords. For example, if you wanted to create a random eight digit password, you could hit the Rand button and use the last eight digits of the random number for your password.