I have been on vacation to Europe for 5 weeks, and I have just returned. Before the vacation, I turned my cellular data off, because I wasn't looking to bust the bank in order to use my phone. Throughout the vacation, my phone always said "Searching..." at the top left. As soon as I arrived at the JFK International Airport in New York, I turned my cellular data on, but my phone still says "Searching..." and even "No Service." As of right now, my iPhone still says "Searching..." and I cannot make phone calls nor connect to LTE (which I have turned on). I have tried every method I could find on the internet, but with no success. I would really appreciate it if any of you guys could help me. Thank you in advance. By the way, I use Sprint...