Why did someone send me a fetion showing that his name was in the mobile phone business card, but I sent them a fetion showing 12520+ my number?

12520 is the dedicated port of Fetion. Every time you send and receive a short message by Fetion, 12520 will be automatically added in front of your mobile phone number. In fact, any number can be added before the mobile phone number. If there is the name of this number in the address book, this business card will still be displayed normally, and so will the general mobile phone.

If your friend's mobile phone can't display your name normally, it's better to ask the other party to add one more number to your name details in the address book, which is "12520+ your mobile phone number".