Drop ID & Imessage/FaceTime etc not hot while transoceanic.

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Boyfriend is currently out of the constituents deployed. His iPhone cut short allowing him to use iMessage, FaceTime or use his Globule ID. He’s witnessed in on the get back to and using a different app to keep in tactility. Is there a way he can fix this? He cancelled applicability and only uses wifi to use the get back to. Please help