How to send a text message to a friend in Thailand?

The number displayed on his mobile phone is not his real number. Thailand's mobile phone numbers all start with 08, 10 digits. Like my own, it starts with 085, and then it shows the same way when I call back to China. Under normal circumstances, I usually send a text message to my friends in China first, and then they can send me a text message and reply directly, or I can save the displayed number when I send it. I don't know exactly how my number was displayed in their place after I sent it, but they can all reply. You can ask your friend to send you a message the next time he calls you, and then you can reply to him, so that you can save that number. When he sends you a text message, remember to add +86 in front of your mobile phone number, otherwise you can't send it.

PS； Domestic mobile phones can also send text messages to Thai mobile phones instead of making international calls.