Make sure roaming is set to on here. If it isn't move the slider to on and click update. This will present you with a green success message. It may take up to 24hrs for this to go live on your account.
You can also check the call barring option to stop calls abroad isn't set to on.
When you arrive in your destination you may need to do the following with your handset:
Turn your phone off and then back on again
Go into your phone settings and select a network manually.
Try removing your phone’s battery, while it’s still switched on – this helps reboot it and find a local network
If you experience any difficulties and would like to speak to us directly please call our mobile team on +44345 6000 789 .