I got my iP4 a few days ago. I am confident that I am sticking with it. So my 3GS went to the wife and the 3G went to the daughter for an iPod. Backed up 3G and restored 3GS for wife with no issue. Restored 3G to stock and ran into an issue with "No Sim Installed" at activation point in iTunes. My question is if I was to throw in my old SIM from the 3GS into the 3G and activate the phone would I have issues with me iP4?