SMS短信PDU编码

目前，发送短消息常用Text和PDU(Protocol Data Unit，协议数据单元)模式。使用Text模式收发短信代码简单，实现起来十分容易，但最大的缺点是不能收发中文短信；而PDU模式不仅支持中文短信，也能发送英文短信。-SMS SMS PDU encoding, send text messages commonly used Text and PDU (Protocol Data Unit Protocol Data Unit) mode. Text mode to send and receive SMS code, very easy to implement, but the biggest disadvantage of being unable to send and receive Chinese text messages　PDU mode not only support Chinese SMS, English SMS can send.