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Search google for Christmas Ringtones (make sure the file you download ends in .m4r), download the file and add it to iTunes, then sync that track to your phone.
 
Search the forum there are a few ways of doing it - however, I urge you not to have an xmas song as a ringtone, nothing more annoying! :D
 
however, I urge you not to have an xmas song as a ringtone, nothing more annoying! :D

More annoying than xmas ringtones:
1. Lady Gaga
2. Justin Bieber
3. Miley Cyrus

I suppose you could go with Twilight ringtones, but the only people who would recognize it is teen girls.

I am not a fan of xmas music unless it's "Grandma got run over by a reindeer", but it could be worse, and it's only for a couple of months.
 
Are you using a Mac?

If so I purchased Ringer - Ringtone Maker from the app store.

Was $0.99, but hmm showing as $3.99 now. Anyway, I'd use some sort of ringtone maker. There are even free apps for the iPhone where you can make your own.
 
More annoying than xmas ringtones:
1. Lady Gaga
2. Justin Bieber
3. Miley Cyrus

I suppose you could go with Twilight ringtones, but the only people who would recognize it is teen girls.

I am not a fan of xmas music unless it's "Grandma got run over by a reindeer", but it could be worse, and it's only for a couple of months.

+10. Hahahaha :) I just use the default ringtone. :) Much less annoying.
 
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