Why does Apple send a message to a person? The arrow is gray.

There may be many reasons. You can filter them as follows:

1, first check whether the cell phone signal is normal.

2. Then check whether the SIM card status is normal.

3. Check whether the send key is displayed in bright color and clickable.

4. If you can't click Send after entering the text, the "Send" key is still gray. Please set > SMS > turn off the display of the subject bar.

5. If it is a group SMS and the numbers are entered manually, please make sure to separate each number with a line break instead of a space.

After the above problems are eliminated, you can first check whether the number of the SMS center is correct. If it is not correct, you can delete it first and then reset it. After setting, you can check whether the number of the SMS center is correct again.