How much is it to send text messages abroad by mobile phone?

First of all, you need to turn on GSM, as long as you have a cell phone signal, you can use it anywhere in the world. You need to apply for an international roaming package, but the price is very expensive. The SMS fee is generally 1 yuan. Some netizens detected that one piece was sent to China and the other was sent from China, and the domestic charge was 10 cent. But the image doesn't seem to work.