The basic purpose of the iPhone lock screen is to keep your device from turning on accidentally when it’s in your pocket. But that doesn’t mean that the only thing that matters on the screen is the “slide to unlock” switch at the bottom of the screen, as anyone who’s ever pulled their phone out of their pocket just to check the time can tell you.
While Apple doesn’t make it very easy to customize the lock screen, if you have a jailbroken iOS device you can install a nifty app called LockInfo which lets view Mail, Calendar, SMS, Phone, and other information on your lock screen. Just tap the power or Home button on your device to turn on the screen and you get an overview of your important information, no sliding required.
But what about tasks from a third party calendar/task app like Pocket Informant? No problem. While the developers of Pocket Informant aren’t officially supporting the project, a third party developer has developed a Pocket Informant plugin for LockInfo.
In order to use the widget, you’ll need a jailbroken iPhone or iPod touch with Pocket Informant and LockInfo installed. Then you can download the “Pocket Informant Tasks Plugin for LockInfo Native” plugin from the Cydia store to see tasks from PI on your lock screen.