What numbers and symbols should be added in front of short messages sent from Chinese mainland to Taiwan Province Province?

You have to add 00886, and you have to open international roaming. Even so, you can't get much. I've tried it many times, but I don't have to worry about using the short message card of Taiwan Province Province, and I don't need to add 00886. Just enter my mobile phone number directly. Taobao or pat will sell it. Their platforms directly cooperate with Chunghwa Telecom in Taiwan Province, Taiwan Province Mobile and China Telecom in Chinese mainland. You can find the short message card of Taiwan Province Provincial Bank on Taobao.