Samsung’s developer Media Mushroom has release an Android app named Easy Phone Sync that is a pretty easy way to acquire the data from your iPhone and iPad to your newly purchased Galaxy S III, it will transfer the contacts, messages, photos videos, music, podcasts and playlists, you’ll need to make use of the iTunes, first make the device backup of your iOS device with iTunes on your computer on your computer, and then use both apps to transfer it to Samsung smartphone.
Easy Phone Sync features
Transfer your iTunes music and podcasts to your phone
Transfer your contacts, messages, photos and videos
Continue to use iTunes with your Samsung Galaxy S3