Solution to the problem that mobile phones can't send short messages.

Mobile phone can't send text messages. I suggest you check the following steps to find out the reason.

Reset SMS center number

It is recommended that you click SMS-Menu-Settings-Advanced Settings-SMS Center Number to reset.

Check whether there is any arrears.

I suggest you try to call your friend to see if you owe money.

Try another card.

I suggest you try whether other cards can be used normally when plugged into Xiaomi's mobile phone.

Clear cache

If it still can't be solved, please back up the data and enter recovery to clear the cache, user data and all data. After entering the system, don't recover the data for the time being, and try to send SMS directly.

Brush the line to the latest development version

If it still can't be solved, it is recommended to back up the data and try the latest development version.