Confirmed with Apple today. If you are browsing the web on edge data service (not wifi, make sure wifi is off) or email is being sent or transmitted your phone will absolutely NOT WORK! Apple stated this was to maximize the edge experience. By turning off the edge channels used by the phone (for voice) while the phone is in edge data mode more bandwith is available for the data service. I discovered this today while surfing and downloading email I missed 8 calls in a row, phone never buzzed, never rang nothing. You can test this out yourself, turn off wifi, now start downloading email, now call the phone from another phone. You will go straight to voicemail. Or you can try this... place a call, put the phone on speaker now try to go and check your email, you will rec a message about the edge data service not being available while the phone is in use! So basically immagine you are somewhere w/o wifi and you are opening web pages and the like, perhaps getting an update or something, or perhaps a really large attachment. All voice calls will be re-directed to voicemail NONE will get through.. or immagine you need to make a call while the device is on the data network no-go! I begged them to please change this, they would not (apple) confirm if or when they would change it but indicated they could change via a software update!