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In France. Vodafone text says all ok for in France. But sweet FA for phone text etc, why? Settings all seem good.
It might be worth just double checking your phones settings to ensure nothing is hindering connecting @richv
Perhaps as a process of elimination can you insert your SIM card in another phone.
Double check your myvodafone to check no roaming bars are activated and live chat can check their end too.
Also this could be an issue with the French network itself.
Sadly as Vodafone UK have no direct access to the foreign network they cannot guarantee everything will work.
Current Phone > Samsung Note 20 Ultra 5G - SM9860 Snapdragon.
Samsung One Ui 2.5 / Android 10.