UTStarcom PLS-7075 Phone Manual page 145

Can I sign out of data services?
You can sign out without turning off your phone; however,
you will not be able to browse the Web or use other data
services. While signed out, you can still place or receive phone
calls, check voicemail, and use other voice services.
You may sign in again at any time.
To sign out, go to Settings > Web > Disable Web in your
phone's menu.
Section 3B: Sprint PCS Vision 135