National Geographic Talk Abroad SIM - 1070 International SIM Card International prepaid SIM card for GSM phones with low calling rates; requires GSM phone (tri- or quad-band recommended) Provides coverage in more than 100 countries, with unlimited free incoming calls in over 60 countries One phone number in all destinations (UK phone number provided) 30 minutes of initial call credit to the United States from many popular destinations; easy to reload via customer service 7 days a week Includes voice mail, text messaging, and 24/7, U.S.-based customer support