The Wileyfox 2 Swift has a MicroSD memory card reader. If your personal computer can also read that card type (Most notebooks are so-equipped), you should be able to save music files
The Wileyfox 2 Swift is a smartphone. Most smartphones will let you save any mp3 song available online by touching and holding your finger on it, then selecting 'save.' Once a music file is stored on your library, tap-and-hold it and select 'assign' in the contextual menu.
The Wileyfox 2 Swift is compatible with the 'USB Mass Storage' norm. Get a USB cable (There might be one in your Wileyfox Swift 2 package) and, linking your Wileyfox Swift 2 to your computer should make it appear as a memory key. Open it and just drag songs or other sound files directly to your Wileyfox Swift 2, as if it was a folder in your computer. For the remaining steps, please refer to your Wileyfox Swift 2 manual. The ringtone section should explain how to assign an uploaded file as a ringtone.
The Swift 2 is equipped with Bluetooth version 4.1, which lets you connect to your computer wirelessly. Just pair phone and computer together and drag and drop any music file from your computer to your Wileyfox Swift 2.
If the above-mentioned tips fail or if you prefer not to buy new accessories, you can always use one of the numerous free '3G Uploader' services available online. A search on Katapulco should retrieve plenty of them. 3G uploaders are simple: Transfer your own ringtones on their web site and they will provide a URL. Navigating to that URL with your Wileyfox Swift 2's browser will download the free ringtone.
More on free ringtones
Here are links to some of the 100% free ringtones (Wileyfox Swift 2-compatible) offered here at MartinsRingtones.com:
Free 'Unclassified' Ringtones Free Tropical Ringtones Free Ringtones-a-gogo Free Techno Ringtones Listen To All Our Free Polyphonic Ringtones