Has he scanned for all available networks to see if his device will connect to any ?
Not sure what restriction you have lifted so are you using a spend cap as although you don't have to to if you do it needs to be high enough for his stay.
His his phone set to abroad:
Apple:
Settings > Mobile Service > SIM Applications > Make sure this is set to Abroad.
Android:
Sky Menu App or SIM toolkit > Roaming > Make sure this is set to Abroad.
Is the phone compatible with something called VoLTE Roaming, also known as 4G Calling abroad:
https://www.sky.com/help/articles/sky-mobile-roaming-in-the-usa
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