What are the etiquette of SMS?

1.xx mobile phone number change notice: Friend, I changed my number. Don't forget to save it and keep in touch. The old number is used until the end of X, and the new phone number is xxx. Remember to contact frequently! 2. I changed my number! Please keep your friends in order to keep in touch! Xx has changed the mobile phone number to the original number! Xx, change the number to: xx, in order to keep in touch, please stay as friends! 3. Hello, excuse me! I changed my mobile phone number because. Please forgive the inconvenience caused by changing the mobile phone number to, and please save it. At the same time, I wish you a happy life and all the best.