What happened to the failure of sending iphone 6 mobile phone information?

iPhone can't send short messages. the solution is as follows; \xd\1. Whether the signal of the mobile phone is normal. \xd\2. Check whether the SIM card status is normal. \xd\3. Check whether the send key is bright and clickable. \xd\4. If you can't click Send after entering the text, the "Send" key is still gray. Please turn off "Show Subject Bar" in Settings > SMS >. \xd\5. If it is a group message and the numbers are entered manually, please make sure to separate each number by pressing line feed instead of space. \xd\6. After the above problems are eliminated, you can first check whether the SMS center number of the mobile phone is correct. If it is not correct, you can delete it first and then reset it. After setting, you can also check whether the SMS center number is correct again. \xd\ The specific operation method is as follows: \xd\1. To inquire about the set SMS center number, dial *#55*7672# with iPhone. \xd\2. Delete the SMS center number: dial ##55*7672# with iPhone. \xd\3. Set SMS center number: dial *55*7672*+86 SMS center number # with iPhone.