My E7 1 message suddenly doesn't show the sender's name. Why?

All my phone numbers are stored in my phone, and the sim card has been deleted. . There is no phenomenon of duplicate names and multiple numbers, and there is no phenomenon of multiple numbers with the same number, but the information still cannot show the name, and the incoming call only has the number. . . It seems that many people have this situation. . Information copied from Nokia to E7 1 can display names. What's going on here? . . .