I have an iPhone 3GS which is updated to the 4.3.5 iOS. Although this is an iPhone I have only used it to download apps and use it as WiFi. I did not have a SIM card inside of it before and it did work fine. My friend who previously used the iPhone gave me it with no SIM and it was jail broken. After I reset the iPhone though the settings on the phone it tells me "No SIM card installed. Insert a valid SIM with no PIN lock to activate iPhone. I do not have a SIM card. What can I do to activate the phone to just use it for WiFi and download apps (basically using the iPhone as an iPod Touch) I am using a Windows OS. *Sorry if there has been threads about this before. Thanks for your help.