How do I transfer app data/settings from an S3 to an S6? When I turned on the S6 for the first time it said by using NFC it would transfer all my info.  I don't know if I did it wrong but all the apps on my new S6 are empty. The settings and levels completed in games do not appear on the S6.  Is there any easy way to transfer EVERYTHING from my S3 to S6.I don't have access to a PC. My S3 is rooted if that helps with suggestions.

S3 OS: 4.1
S6 OS: Lollipop latest
Since your S3 is rooted. You could make app backups with a 3rd party app, Such as Titanium Backup, but to use Titanium back up to restore them on your S6, It would need to be rooted as well. I know Google claims that its back up service saves app data and settings as well. But I think that only works if the app dev has added in the option to store things in the cloud. 

Personally I can say that TB works like a charm for me. For non-rooted options(I assume your S6 isnt rooted if you dont have access to a pc). It looks like https://play.google.com/store/apps/details?id=com.koushikdutta.backup.license&amp;hl=en can back up to the cloud. Only reason I linked the paid one is cause the free one doesnt allow you to back up to the cloud.