Hello, how to convert the SMS center number to PDU format?

Add an English letter "F" to the end of the SMS center number, and then remove the "+" sign at the beginning. Two numbers from left to right exchange positions and are arranged sequentially. After completion, add "0891" four digits to the beginning of the center number. If you feel that the above method is too cumbersome, you can query the PDU conversion tool on Baidu or download the author's Baidu Netdisk sharing tool from the reference to convert the PDU format.