Use your smartphone abroad the same way you do at home—it can be done, and without paying hundreds of dollars in roaming charges. I took my Verizon Wireless iPhone 5 to Germany and England and used it in different ways in both countries. In Berlin, I used my smartphone with only Wi-Fi. In London, I opted to buy a temporary British SIM card so I could use my phone exactly as I do at home. Here's what I learned about using a smartphone overseas from both experiences.