Sunana is going to Iceland and Europe later in the year, and will be driving all over. Leo says to make sure to bring a good camera. What about getting data for GPS and directions? Leo says the issue is international data roaming and it's punitively expensive. T-Mobile offers unlimited data overseas, but it's at the much slower speed of EDGE.
Sunana should check out prepaidwithdata.wikia.com to find out what is the best local SIM card companies for the countries she's visiting. She can also rent a MIFI and get Wi-Fi access through the LTE network for all of her devices. Sunana should also turn off international data roaming and just use local Wi-Fi.