I bought a galaxy note 10.1 international unlocked tablet to take on a trip around the world. Now I would like some advice re the sim card to get. The telcel $70 a month plan seems to have unlimited data and wifi and is good in all the countries we will be visiting (in Africa and se Asia) except for Tanzania. Would that be a good choice? Or should I wait and get a card in the airport. There are also various other international cards and I can't find much that explains the options. We are staying about 10 days in each country, 100 days in all. Any help would be greatly appreciated!