Your R11 Plus sports a microSD memory card slot. If your laptop or personal computer has a slot for that card format (Most laptop computers are so-equipped), you should be able to transfer music files
The Oppo R11 Plus is an Android smartphone and the Android market offers a bunch of free ringtone apps such as MP3 Ringtone Maker, Myxer and more.
Here is a sample of the free ringtones (compatible with your Oppo R11 Plus) we offer:
Free Horror Ringtones Free Ghost Ringtones Free Short Ringtones Free Techno Ringtones Hear All Our Free Polyphonic Ringtones