You may have text messaging issues if your phone is:
These steps help identify and resolve the underlying cause. After completing each step, test to see if the issue is fixed. If not, continue to the next step.
Verify airplane mode is turned off.
Update the PRL.
Perform a soft reset.
A soft reset reconnects your Virgin Mobile Lumia 635 to the Virgin Mobile network.
Have you ever been able to send or receive a text message on your Virgin Mobile Lumia 635?
If your Virgin Mobile Lumia 635 is active and you've never been able to text, contact Virgin Mobile Customer Care for further troubleshooting.
Note: To optimize device performance, be sure your Virgin Mobile Lumia 635 is running the most recent device software. Check for software updates.
If you're still having issues, contact Virgin Mobile Customer Care.