Win7 and iPhone 4
Gave up after several hours. Called AT&T. Big mistake. Do not do that.
The rep moved the number from the old SIM to the new one. Old phone is now dead. iTunes will not recognize the new one. One is dead, the other is not activated.
The best option that the guy could give me was to try to activate on a different computer. Another was to do a cold boot. Neither of these worked.
Cannot even jailbreak this brick. Goes on the shelf with the that Palm Treo 680 that I never used. Have iOS on the old phone. Cannot even jailbreak it.
1 hour later
Well, I got Apple support on the line. They got AT&T on the line. By this time I had installed iTune 9.2 on another machine (XP; the first one was Win7.) Low and behold, that worked. iPhone 4 is being "restored" on the Win7 machine as we speak and where it has about 6 minutes to go. Then all I have to do is transfer any meta data that is not in the backup.
I think this may be a WIN7 problem. When I attached the iPhone to the XP machine, it immediately displayed its IMEI and its CCID. It did not do that on the WIN7 machine. The activation process may have been trying to read these and was unable to.
Incidentally, the Apple folks wanted to treat it as a hardware problem and send me a new phone. That would not have helped at all.
8 hours later
Everything is finally working well. Restoring the 3G image took much longer than I expected.
Got few bars. Phone did not see the 3G Micro-cell. After an hour and seven dropped calls on the phone to AT&T, it mysteriously began to work. Do not know who did what to finally make it work. Tomorrow I will try it in the TomTom car kit.
Oh, incidentally, AAA Roadside does not work. Same version is working on 3. Have reported it.