I've upgraded my original iPhone (2G) to 3.0. For a couple of days after the upgrade, I haven't been receiving any calls or texts. I heard a lot of EDGE data going through my speakers (the buzzing), the phone was getting overly hot, and the battery went down like crazy. And I then restored it, and I started receiving calls again. So I figured it had something to do with the push (constantly polling) email and push notifications. It turns out that push is the reason I can't receive phone calls. (Turn push email/notification on, can't receive phone calls, turn push off, receive phone calls/texts). I don't remember this ever happening in the older firmwares though? I had push Yahoo accounts before... they've never behaved like this. I know data and phone calls cannot flow together on EDGE, but it is odd because when I turn push on, phone calls do not go straight to voice mail; it rings 4-5 times before it does. Texts just vanish until days later. I got 16 texts today-- that were from Saturday. What's worse is when I turn EDGE off in SBSettings/BossPrefs, whether I'm on WiFi or not, this phenomenon still happens. I can still hear the buzzing in the speakers with EDGE off/WiFi on/Push On. The phone was unlocked back in the day using PwnageTool (for when I was on T-mobile,) but then I switched to AT&T with the iPhone plan, and now I'm on AT&T with a BlackBerry plan. Now I just use the iPhone for casual weekend surfing and games. I still have AppleCare until next week, does this problem warrant a new phone? My friend with an original iPhone had the same settings as mine, and his calls/texts go through so I'm stumped. Any help would be greatly appreciated!