How does the Nokia 5700 clear its inbox and always prompt for unread text messages or missed calls?

5700 text messages don't need to be deleted one by one. I'll tell you a way.

Open the message → Inbox → Options → Mark/Unmark → Mark All →→→→→→→→ Press C to delete `.

As for what you said (you can ring or flash occasionally when you don't read the text message or answer the phone),' If this is the case before, it will be fine to set it once in the factory'' By the way, the initial password is 12345'

Good luck.