Name: Your Name (What ever you want)
Email: Your email address is your username
Password: Your so-net.new.jp account password
Description: so-net.new.jp
Click Next Button
Hostname: pop.so-net.ne.jp
Username: Your email address is your username
Password: Your so-net.new.jp account password
Hostname: mail.so-net.ne.jp
Username: Your email address is your username
Password: Your so-net.new.jp account password
Click Save Button
Use SSL: None
Authentication: Password
Server Port: 110
Use SSL: Yes
Authentication: Password
Server Port: 587
You can login so-net.new.jp and Signup for so-net.new.jp new account on your iPhone from here.