Why can't Redmi 1s Mobile 3G send messages?

Mobile phones can't send short messages, and there are usually the following possibilities:

The first situation is that the network signal is not very good, resulting in network delay. After the phone exits the interface, it enters again, showing that it has actually been sent. In this case, please press the sensing key on the right side of Home. Just re-enter it.

Check whether the mobile phone is turned on in flight mode or not, and then turn it on.

Another situation is caused by the use of mobile phone management software. Generally, there will be a startup prohibition item in mobile phone management software. After entering this software, check whether SMS is also banned. If it is banned, just change it and restart the phone.

In another case, I turned off the SMS function. This situation can be solved by calling 10086 to provide manual service.