I bought a second-hand Nokia 7 10, which contains photos, contacts and text messages. How to delete all contacts and delete logged-in messages?

Wp system cannot delete all contacts, because one mobile phone corresponds to one account. If you want to use it in the future, I suggest you re-register an account. There is a message in the phone settings, and there is a reset phone. Just log in to an account after reset. As for the software, you can download it directly from the mobile phone mall, which is very convenient, but it is recommended to use wireless network ~