I will be upgrading to a faster, larger-capacity iPhone when the new model is released. My 6-yo son enjoys playing games, music and watching video on my current 3G, so I'd like to let him use it as an iPhone touch after my upgrade. I'd like everything to work except the phone and cellular data (wi-fi's fine). My question, is there anything I need to do other than take out the sim? As an aside, I know some phones allow 911 and operator calls without a sim card, is that the case here? I'd rather my kid not be able to dial out.