All calls are free to the UK or any other euro zone country from Tenerife.
The (standard) message that O2 customers get texted when working on a mast is that 4g calling has been turned off. It's meaningless and will be sent to any number previously registered on the mast they are working on.
Rebooting usually fixes the issue although it is irrelevant to the OP in this case as they are abroad and not using the mast in any way.
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.
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