How to remove the automatically added number prefix when sending text messages to Android smartphones?

Create a new message, then the recipient fills it in manually (or adds it directly to the address book), and just type a word to send it. This message has no prefix, and the other party's reply message has no prefix.

It's simple. Similar to Fetion SMS, Wing Chat adds a prefix to the SMS sent between telecom users, which means that this SMS is not sent directly, but through Wing Chat server, so it is free to send it through the network.