If you’ve been battling Virgin Mobile USA’s technical support drones and have been unable to get 3G data access, check that 3G data is enabled on your phone.
From the main screen:
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Press the menu button
Select Settings
Select Wireless & Networks
Scroll to the bottom of the menu and select Mobile Networks
Make sure “Data Enabled” has a green check mark next to it
Virgin Mobile USA (i.e. Sprint) was unable to solve this after three phone calls over the course of a day. Their technical support script jumps straight into cellular network settings and battery removal.