Your SC330 is equipped with a Up to 64GB memory card reader. If your laptop or personal computer can also read that kind of card (Most laptop computers are so-equipped), you should be able to transfer music files
If these tips do not work for you or if you don't want to buy extra accessories, you can always use one of various free '3G Uploader' services available online. You should find plenty with a simple Katapulco.com search. 3G uploaders are easy to use: Upload your own free ringtones on their web site and they will return a temporary web address. Pointing your Jethro SC330's web browser to that address will download the free ringtone.
Learn more about making your own free ringtones
Here is a sample of the all free ringtones (compatible with your Jethro SC330) we offer:
Free 'Unclassified' Ringtones Free Ghost Ringtones Free Short Ringtones Free Techno Ringtones Hear All Our Free Polyphonic Ringtones