Unable to make calls

[BobC7]

I'm presently in the US and have been making and receiving calls to and from the UK until yesterday. 
I cannot now make calls unless I turn Airplane mode on then off. I am then able to make one call. Subsequent calls fail unless I again switch airplane mode on and off again!!

I have undertaken ALL corrective actions on the Sky website. Nothing resolves the issue. 
I receive calls and data is working fine. 

Any suggestions??

Thank you. 

[caesarome]

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@BobC7 wrote:

I have undertaken ALL corrective actions on the Sky website. Nothing resolves the issue. 

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It is tricky to help without knowing what you have done so is your 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.