I have had a couple on instances where edge was showing on the screen, but the phone refused to connect, and after a battery pull, it went back to GPRS.
Posted from my CrackBerry at wapforums.crackberry.com
Confirmation of the Voda/Edge situation from a moderator on the Vodafone eForums:-
"EDGE is old technology, and we've 'skipped' this to focus our attention on faster data service - HSDPA and beyond! There may well be a handful of rogue EDGE cell sites out there (perhaps from network sharing masts or for testing), but that couldn't possibly warrant us promoting it as a main feature to our network. We don't have plans whatsoever to increase EDGE coverage"
there was an internal memo regarding edge on vf a week or so ago, basically you will find it in some places as its been used to replaced failing 2g only sites, kinda makes sense, no-one would launch it `just because` but if your gonna replaced it, then do it properly eh
oh and 4G is available too (well, i have a 4G dongle, only 3g in my area, but lets see what happens eh