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EDGE is a high speed GSM-2G. More reliable than 3G and nothing at all to do with 3G. About 245 kbps. Basic modem based GSM-2G is 14.4kbps per channel and was charged per second connect time. The EDGE may be charged per second or by kilobyte, depending on era, operator and contract.
In Europe GSM-2G used lower bands than 3G. Later 3G took over some GSM bands and then in turn those became 4G. In Ireland the current Electricity Smart Meter roll-out uses 2G-GSM-EDGE and 3G. The 3G is mostly gone. So here indeed the DXG no longer connects on 3G but uses EDGE.
However the K1 and K2 and original DX have poor screens and old Mobil, no better AZW3/KF8. The DXG was a cynical update as it was simply a better screen on the DX. It doesn't have the RAM of the K3 (slightly earlier), nor WiFi. So the K3 got azw3/KF8.
The DX/DXG was also hyped for PDF, but it's garbage for PDF with the lack of RAM, slow CPU big margins and only 150 dpi. The PW3 works better for PDFs (as do all the Kindle 6" 300 dpi models).
I regard my DXG as a museum exhibit. I was mad wasting money replacing the battery and wasting time jailbreaking. In the end I only left the Sleep screen mod. Now that we have abandoned old mobi / KF7 production & test I might put the better Serif font mod.
What were Amazon thinking of from K1 in 2007 till they did the AZW3/KF8 (later backported to K3 and later)? Basically almost 20 years obsolete in computer terms, with only Left To Right, no emebedded or user fonts, just normal, bold, italic and bold italic of an ugly Serif, sans and monospace. Only Latin-Roman with a few Scandinavian and Greek characters. So stupid. Eink was no excuse.
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