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1) EDGE is not something separate from GPRS it is simply a new set of channel codes (and a new modulation). A phone that "does" EDGE must also "do" GPRS and the vendor would have to be stupid to not also "do" GSM voice. Same thing applies to base stations and so you will not need a have "EDGE carriers" and "GSM/GPRS carriers" but would tend to have "old carriers" (GSM/GPRS only) and "new carriers" (GSM/GPRS/EDGE) and so the traffic engineering is not as hard
2) Cell edges would tend to use the "old" channel codes (long live CS1) with the middles of "EDGEd" cells using the "new" (EDGE) channel codes. This means that your cell engineering remains the same (no new cell sites to deploy EDGE except for normal cell splitting as the traffic builds up).
3) BUT the average (over time and over all users) bitrate will not be enormously bigger (my earlier posting suggested x2 only).
4) You could do better if you deployed EDGE only carriers (no voice or normal GPRS terminals would be assigned to them) but then you would either need smaller cells or a wider reuse pattern and I don't see an operator having the spectrum unless them deployed this in rural areas using their 3G licences