I checked online before I left the UK and call roaming was on and international call barring was off for my phone account. My partner who is also with virgin rang 789 for her phone and was told hers was also active.
Now we are in USA and there is no call roaming! We have tried rebooting. Clearing the carrier settings. Manually selecting a carrier - AT&T and T-Mobile appear. Tried them both but they don't connect. Rebooted again, but no difference.
We are both pay monthly and have been for years and are both iPhone 6s users.
I don't think our phones roaming has been set up correctly by your technical team. Please can you rectify asap.