I am using my 2G Iphone as a IPOD/internet device for the time being. I already upgraded my 3G phone and everything went fine. But when I update the 2G, it says I have to insert a SIM to activate. Do I have to take my SIM out of the 3G activate the 2G, then put it back into the 3G? If so, will i have to restore the 3G in the process wiping my data and start clean? Thanks for any help.