Add text to unlocked screen on iPhone - iphone

How I can add some text to unlocked screen on iPhone? I saw some application, that write text on unlocked screen.

You need jailbreakers iPhone and use application "Custom Lock" from http://rpetri.ch/repo/
This may not be in the AppStore, because it violates the rules of Apple's applications that may be in the AppStore. http://www.youtube.com/watch?v=cRFt_ttEwpA&feature=player_embedded

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Why my iPhone app is not shown on iPad App Store?

I have released a new app, Il Cervellone, in my Country (ITALY).
My app is an iPhone/iPod touch app, but, usually also iPad devices can installs iPhone application but my app is not shown in iPad App Store.
Why?
How can i solve it?
maybe you have 6.0.1 on iPad...
iOS 6 with iPad: App Store search won't show iPhone Apps if search query has no results for iPad Apps
You must Change Your App Store Account Location :
Tap "Settings" from the main menu of your iOS device.
Tap "iTunes & App Stores"
Tap "View Apple ID."
Enter your user name and password.
Tap the space underneath "Change Country or Region."
Select the region where you released your app"
Tap "Done."

How to add my app to iPhone's Search Screen?

Is it possible to add my app to the iPhone's search screen? I mean, when the user types some search terms on the search screen, is it possible that my app appears on the list so the user can select it and search there?
Thanks!
Currenly there's no public Spotlight API in iOS (it is available to Apple apps only). Such an API exists on the Mac, hopefully we'll see it on iOS soon too.
No, it's not possible to add items from your app to the iPhone search screen. The user can find your app if they enter a search string found in the title of your app (e.g. "foo", if your app is called "MyFoo"), but the iPhone search screen won't search your app's documents.
If I understand your question correctly...
Your app should be showing as a result if you start typing in your app name.
As long as its installed on the phone. Make sure to include your icons for that screen in the bundle.
small-icon#2x.png 58x58 pixels
small-icon.png 29x29 pixels

Which document describes which application icon sizes are needed to submit an app?

It's crazy, but I can't find it. The HIG seems to talk only about system icons like "favorites", "search", etc.
Is there a special document that talks about this? Also, how must these icons be called and where must they be added?
Have you checked iTunes Connect Developer Guide? It describes submission related things.
I've only been able to kind of distill it from the HIG, but here's a blog post that's very helpful:
http://kgutteridge.co.uk/blog/2010/07/04/icon-sizes-filenames-for-ios-devices/
iTunesArtwork – Icon for iTunes AdHoc distribution (512×512)
Icon#2x.png – Home screen icon for iPhone 4 (114×114)
Icon-72.png – Home screen icon for iPad (72×72)
Icon-Small#2x.png – Settings/Spotlight icon for iPhone 4 (58×58)
Icon.png – Home screen icon for iPhone 3 (57×57)
Icon-Small-50.png – Spotlight icon for iPad (50×50)
Icon-Small.png - Settings/Spotlight icon for iPhone 3 (29×29)
Might also check this out too for a bit more crucial info:
mrgan.tumblr.com/post/708404794/ios-app-icon-sizes
This is detailed in Apple's Technical Q&A QA1686: App Icons on iPad and iPhone.
Since this is one of the first questions that comes up when searching for the necessary icon sizes for iOS Apps, and in the meantime, things have changed again with the appearance the new iPad ("3"), I'd like to add the currently relevant information here:
Apple has conveniently collected all the details about custom icons and images in one place now. Here goes: iOS Human Interface Guidelines: Custom Icon and Image Creation Guidelines

Is it possible to make my iPhone app's icon look correct on both the iPad and iPhone?

Our CEO wants our iPhone app's icons to look correct (ie not scaled) on both the iPad and iPhone. He does not want to actually create separate versions, or a universal version of the app. The app will remain iPhone only, but the icon would need to show up proper on both devices.
This is a "business decision", and I think its rather silly but regardless - is this possible? OR would we have to create a universal version?
No. You have to create all the 72x72 (iPad), 57x57 (iPhone) and 29x29 (Settings, if you have one) icons, if you(r boss) don't want scaling.
And you need to create a 512x512 version to submit to AppStore anyway, so I don't see a reason to avoid an extra image.
To use the 72x72 icon for iPad, see How do I specify both icons for a universal iPhone/iPad app?.

Setting iPhone wallpaper (locked screen background) programmatically?

I have an app which could benefit from the user being able to choose to set an image as the wallpaper (the background image on the "slide to unlock" screen).
Is there a way for non-jailbreak third-party apps to do this? A search for "wallpaper" in the iPhone documentation returns nothing.
There is no way to do this with the current SDK, if you want to do it you should file a bug.
If you're writing a jailbreak application you can write to /var/mobile/Library/LockBackground.jpg and then kill the Springboard.