iPhone upgrade -> 3G, activation

[BusError]

I was walking in town and asked the local carfone wh*rehouse if they had any 3Gs, and, they had ! So I picked one up to complement the 'old' 2G. I'm a developer, so I'm quite happy to have 2 targets.

Anyway, I was told I just had to plonk the SIM into the new phone, launch iTune and it would activate. And well, it appeared to work, however iTune refused to restore my 2G settings because the new 3G was running 2.0 and I needed to upgrade to 2.01.
So I did, and restored and it worked fine, but now it seems the 3G de-activated itself. The phone shows 0 bars, or "No Service" despite trying to restore several times etc... the SIM still works fine in the 2G phone tho...

Anyone experienced that before ? Any tip on re-activating the new phone ?

 

[BusError]

Ok, I've figured it out. You need to remove the sim card before doing a restore (the secret combo 10+10 second DFU one)
IF you remove the card, the phone complains that you need a valid SIM to activate, and just popping the card in will do just that, and do a restore afterward happily after.

If you keep the card in, it somehow fails to reactivate properly !

Maybe it's just a corner case I've hit here, but for anyone who might run into it...