When registering a domain name, it's best to fill in all the information, especially if the owner of the domain name is himself, be sure to fill in his real name, because it is related to the ownership of the domain name. Whoever fills in this name belongs to the domain name, so it is best to fill in the real name. If there is no fixed telephone, you can leave it blank. If prompted, you can fill in the previous old one, which is not very important. Also, the email address must be truthfully filled in, because if the domain name is to be transferred or transferred in the future, it is necessary to send and receive emails through this email address, so it is recommended to fill in the real one.
The relationship between domain name registration information and filing information is not very big. Filing is for space. A domain name is just a house number, through which you can find your space and visit your website. So there will be no problem when filing in the future, as long as the relevant information for filing is true and accurate, there will be no problem.