I want to call or send a message to people in Thailand, but why can't they get it?

When calling from China to Thailand, you should add 0066 in front of it, but if the mobile phone number is used here in Thailand, you can remove the 0 in front of the mobile phone number. For example, if the mobile phone number is 0 12345678, you can directly call 0066+ 12345678 to send a short message to Thailand, with the same symbol as the above mobile phone number. As for +66 12345678, the area code of China is 00986, call back 00986+ phone number from Thailand, and the 0 before the landline number can be omitted, and sending a text message to China is +86 123 4567899.