. . "If you subscribe to any of Verizon???s global roaming then you???ll get a Verizon issued SIM that when installed in the iPhone will allow you to roam overseas under Verizon???s global roa By josiespencer October 20th, 2012 at 08:34:44 The SIM card in your iPhone is how your phone communicates with your wireless carrier to make phone calls, send text messages, and work with other data such as email" . .