I purchased an iPhone which my company decided could not be used on there server. I have since been using the device as little more than an iTouch as there is now no SIM card in it (it went back in my BBerry). I tried to update the software and now it will not allow me to sync. The phone shows emergency calls only. HOW DO I GET MY iTOUCH FEATURES BACK? Do I just drop the BBerry SIM card back in?