1.iPhone短信拦截和发送:
http://bbs.51cto.com/thread-844260-1-1.html
2.获取短信内容和短信数
http://stackoverflow.com/questions/10681995/how-to-get-the-message-when-receiving-the-kctmessagereceivednotification-notif/11026338#11026338
3.sms.db相关
http://theiphonewiki.com/wiki/IMessage#Main_database_file
4.iPhone已存在的应用:
SMS counter
SMS Stats