http://tranhoangminh.wordpress.com/2012/02/17/thao-tac-c%C6%A1-s%E1%BB%9F-d%E1%BB%AF-li%E1%BB%87u-sqlite-tren-android/
http://mobipro.vn/thu-vien/android-ios-tutorial-code/android-sqlite-database-bai-6.html

http://stackoverflow.com/questions/5944345/sending-sms-in-android