Samsung SPH-M820 User Manual page 156

Enabling/Disabling 3G Data
Your Galaxy Prevail™ allows you to control your use of
3G data. You can now choose to enable or disable this
feature. With 3G data disables, you must use Wi-Fi to
connect to the Internet.
1.
Press >
networks > Mobile networks
2.
Tap to enable the use of 3G data services.
3G data
(A green checkmark appears next to the field).
143 3A. Boost Service: The Basics
and tap > Wireless &
.