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The 3G costs Amazon. Likely it only works on old Kindles to buy books.
Use the USB port and Calibre, which will also charge you DX.
Also save all the Amazon books on your PC via Download to PC for USB transfer.
Put your Kindle DX serial number in a suitable Calibre plugin to "future proof" your purchases and make backups that will work on a replacement eReader, that need not be from Amazon.
I read the books bought for my DXG and PW3 on my Kobo ereader now. I almost never need to charge as the ereaders charge while I transfer ebooks to them or copy annotations off, even after eject, till the USB is unplugged.
As a publisher I get charged a small amount when people buy our books from Amazon via 3G instead of USB transfer!
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