Why does L7 have insufficient memory when there are more than 30 text messages?

When there are very few letters in your inbox, you can see the name of the sender when you receive a text message. However, when the memory usage reaches a certain level, which seems to exceed 80%, the system It will remind you that there is insufficient memory space and will not display the name of the sender. This is a user-friendly design. I feel that MOTO’s system has always been very user-friendly. For example, when you receive a text message or phone call but you did not notice it. , he will remind you regularly. At this time, all you have to do is to release the memory and delete some information that has no actual value