Int Roaming not working - Jersey Island

Can anyone tell my why my I cannot make or receive calls and I have plenty of roaming data and airtime

CarolynG The Channel Islands are not part of the UK, they are British Overseas Territories with which are self governed with their own laws and tax systems. As such they are not considered as part of the UK when roaming. You'll need a roaming add-on to use your phone there. More information here.

Let me know if you have any follow up questions.