Cannot make international calls from international pre-pay sim

[Laurie1]

I haven't been able for a week now to make international phonecalls from my international sim. I can however receive them and national calls can be made. Postcode PE21 8PX, I have recharged & I do get this message on network status checker: 

''Looks like a nearby phone mast isn’t working as it should, sorry.

Our engineers are likely to be on the case already, and your service might come and go until we fix it.'' I've been trying to contact a relative abroad with health problems, which in the meantime passed away.... I cannot connect whatsoever,  I dial any number abroad and I get immediately busy tone and ''call failed'' ''try again''. Please advise, this is ridiculous. Thank you

[pgn]

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@Laurie1 wrote:

Replied in private Thank you

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Hopefully, @Laurie1, sorted?

I, for one, would love to know what the fix was, if it is known yet.