Thanks for your inquiry and that is a great question! We have roaming agreements with various carriers all over the US. In the off chance you come across an area that does not have Verizon Wireless coverage, you will still be able to use your phone for calls and data. You will not be charged any roaming fees as long as you are in the US and on one of our Nationwide plans. Keep in mind that some of our roaming partners may have limited data coverage, and at this time there is no 4G roaming. So you may have 1X or 3G roaming for data in these areas. You can view our coverage map here.