Can i change the iPhone App icon on runtime?

Hello All,

I want to change my iPhone application icon on run-time, i want to change icon on some event.

I've already tried many things.

Like:
1) run time change info.plist file,
-----------------
NSString *finalPath = [path stringByAppendingPathComponent😡"Info.plist"];
NSMutableDictionary *plistDictionary;
plistDictionary = [[NSMutableDictionary dictionaryWithContentsOfFile:finalPath] retain];

[plistDictionary setValue😡"NewApp Name" forKey😡"CFBundleDisplayName"];
[plistDictionary setValue😡"New-icon.png" forKey😡"CFBundleIconFile"];

[plistDictionary writeToFile:finalPath atomically:YES];
-----------------
It's working fine on iPhone simulator but, not working on my iPhone Device.

2) Replace Old icon.

I've also tried to remove old icon and copied new as a old icon name.
this is working fine on iPhone simulator but, not working on my iPhone Device.

Please Guide me.