GSM手机短信编解码器。可以根据发送手机号接收手机号以及短信的内容自动编码成手机PDU串，也可根据接收到的PDU串解码出短信内容-GSM SMS codec. Can send a phone number and phone number to receive text message content is automatically encoded into the phone PDU string, but also according to the received PDU string