Why can’t Samsung Note send text messages?

If you are a China Unicom user: If you cannot send text messages, there are the following situations, for reference only: 1. Can you receive or send text messages? A: Make sure the business is normal, set the SMS center number, and test with a known good card. 2: Can I send or receive text messages? A: Try using another card from the same operator to send it to yourself. If it doesn't work, contact the operator.