@ConorArnold
You could try turning off automatic network selection in the settings then get your phone to search for other available networks to see if it will then connect and allow you to make calls. Also make sure the spend cap hasn't been reached if you have one set.
Also make sure this setting is set to abroad:
Apple:
Settings > Mobile Data > SIM Applications > Make sure this is set to abroad.
Android:
Sky Menu App or SIM toolkit > Roaming > Make sure this is set to abroad.
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