I can't edit the mail. What's going on here?

The main reasons for this phenomenon are that the recipient is not added in the short message and the SIM card is abnormal. Please investigate and deal with it according to the following methods:

The recipient's contact information has not been added: Please add a contact before trying to send a message. When sending a short message, if the contact information of the recipient is not added, the send button is gray and the short message cannot be sent.

There may be something wrong with the SIM card: On the status bar at the top of the phone, confirm whether the SIM card displays the signal status normally. If the signal is weak or there is no signal, it is recommended that you restart the phone after saving the message, and then try to send the message after the phone restarts. When the SIM card is abnormal, the short message sending button is gray, and information cannot be sent.

If the above methods can't solve your problem, please back up your important data in advance and bring the purchase invoice to Huawei Customer Service Center for testing and processing.