Why can’t mobile phones send text messages to domestic mobile phones?

First turn on the phone, enter the dial-up interface, enter "*#*#4636#*#*" (without quotation marks), wait a moment and the phone will enter the testing (English version is Testing) menu, we can When you see several items appearing on a *** (different mobile phone systems may display differently), they usually include mobile phone information, battery information, battery history, usage statistics, Wifi information, etc. Other options are available for other query functions. Here we Select the first item of mobile phone information (the English version is Phone information).

After entering the Phone information menu, drag the screen to the bottom. You can see SMSC: and an edit box. There are two buttons on the right side of the edit box, Update and Refresh. , you can click the Refresh button on the right side of the edit box. The current SMS center number of the mobile phone will be displayed in the edit box to check whether the number is correct.

If the number is incorrect, you need to fill in the queried local corresponding SMS center number in the edit box on the right side of SMSC, and then click the Update button on the right side of the edit box. If you directly enter the SMS center number Enter the number, and then click the Update button. It may prompt: Update failed (update? error). Obviously, this will not work. At this time, you need to convert the SMS center number into PDU format and enter it, and then click the Update button. So how to convert the SMS center number to PDU format?

Add an English letter "F" to the end of the queried 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.