This tutorial is designed for individuals with a good technical level. Kioskea is not responsible for any problems that might arise from changing your icons.
First, download iPhone Explorer (for Windows or Mac OS)
IPhone Open Explorer and navigate to the directory / apps / listname 'app.app/ nom_de_l'app. app.app (where "nom_de_l'app" is the name of the application that you want to modify it icon) on your iPhone
Locate the name of the icon for your application
o for an iPhone4, it should look like this: email@example.com
o For an older model, it should look like this: icon.png
Make a backup of this file (just in case) and replace it with the icon of your choice
o for an iPhone4, the file must be in PNG format and have the dimensions 114px x 114px
o For older iPhone, the file must be in PNG format and have the dimensions 57px x 57px
After a complete restart of your iPhone, your new icons should have taken it default place.