What the France mobile companies seem to have done quite aggressively is to remove your ability to dial numbers in UK & other Europe countries from the promotional and any forfait level below at least 25 euros a month. All subtly taken away without announcememt since around 8 months ago.
So you can receive calls from those countries in France and when roaming. When roaming you can dial France and Europe / UK. All within your medium or lowish cost forfait. But what is disappearing without warning or announcement from lowish or medium cost forfaits, ie no longer included and charged separately at very high rates, is the ability to dial UK numbers or Europe numbers from France. Forfaits that networks called promotional that included calls from France to UK and Europe until early 2021 have now been removed from offer by the networks and removed from people (me) that had them.
Look carefully, carefully at the wording of what is included in each forfait price bundle. To get the benefit back now requires 10-20 euros more per month and a poorer bundle for the rest of it eg less data if your network pulls your package and you have to start again.