Unable to make international calls from the UK

[BigD]

Hi, 

I have tried the following 

removed cap 

ensured my phone settings allow international calls 

spoke to various o2 representatives 

can anyone assist 

thanks 

[Enlli]

Worthwhile to check barring in My O2

 

[BigD]

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@Enlli wrote:

Worthwhile to check barring in My O2

 

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Thanks, I’ve had a look on my o2, and cannot find those options 

[Enlli]

Conveniently in the App it's under install my SIM!