you need to log into your account and click on the "Plan and device" tab.
Go to "Manage my services" set "Roaming" to ON & "International call barring" to OFF
Allow time for your account to update then reboot your phone by turning it off & on again.
Also, check your phone's settings to ensure that roaming is enabled on the handset.
If you need to call Virgin Mobile. Their UK support line number is: +447953 967 967
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