Originally Posted by darkalex97
It happens a few days ago. In settings>Info>Phone number i see a wrong telephone number. Hangouts said that i changed my telephone number but is not so
You've probably changed your phone number with MNP and android still shows the temporary number your OP gave you... your sim's number is the number android shows, your OP just gave you your old number back and that's it.
(I've got the same situation with Vodafone, and had it before with TIM)