You can try a performing Network Update (to be used only if you've completed setup and activation but can't make or receive voice calls or use cellular data services). Please make sure there's a good signal reception and try the following.
1. Tap Phone icon.
2. Tap Key Pad if necessary.
3. Enter ##873283# then tap Call icon.
4. When Starting Service Update appears, tap OK.
5. When Service Update Complete appears, tap OK.
• The Radio will reset.
• When Virgin displays in the top left corner, the iPhone update has completed.
Please let us know if the phone works fine after this. -EdwinRG.