Sprint PCS PM-225 Phone Manual page 169

Finding Your User Name
If you aren't sure what your Sprint PCS Vision User name is,
you can easily find it online or on your Sprint PCS Vision
Picture Phone.
To find your User Name:
At www.sprint.com. Sign on to your account using your
Sprint PCS Phone number and Password. To display your
User name, click on the My Personal Information menu,
then click on PCS Vision User Name.
On your Sprint PCS Vision Phone.You can find your User
name under the Phone Info option in your phone's Settings
menu (Menu > Settings > Phone Info >
My Phone Number).
160 Section 3B: Sprint PCS Vision