How to convert SMS center number into PDU format

Add an English letter at the end of the SMS center number, and then remove the teaser+ground number at the beginning. From left to right, a group of two numbers exchange positions with each other and are discharged in turn. When finished, add four digits 089 1 at the beginning of the center number. If you think the above method is too complicated, you can query the PDU conversion tool from Baidu or download the author's tool in Resources to convert the PDU format.