I assume that iMessage knows who to send to by their Apple ID? I say this as iPod Touch's can send + receive iMessage's but they don't have sim cards. If that is the case, do I have a problem? I our house I have an Ipad, my two children have a Touch each, one daughter also has an iPad and from Fri my wife and I will both have an iPhone 4S. All devices run under my Apple ID as i pay for the content that we purchase, So, if i get a message, will it appear on all the devices?