Welcome to the Community Forum and thanks for your post. I'm sorry to hear that you are experiencing a problem with making calls on your mobile. It's great to see that @AlexKid has been able to give you some advise about this. Has this issue been resolved for you since your post?
If you are still having a problem with this, please complete our online Phone Fix diagnostics. You can access Phone Fix by:
Log into Your Account online, then go to Plan and device, click on Phone repairs button
Go to Phone Fix via our online Help & Support pages
If you would like to get in touch with the Mobile Team direct, please give us a call on 789 (Freephone from a Virgin Mobile), 150 (Freephone from a Virgin Mobile or Virgin Media landline) or 0345 6000 789 (from any other phone).