I am not sure what is to blame. Is it just Lycamobile? Is it all SMS messages from abroad? Is it the Nokia 5.3 that is to blame?
I have a suspicion it might be Lycamobile (especially as they seem to run British and German data settings in parallel). But I cannot even find the SMSC on my phone to check. Could it be the message app itself that is to blame?
Can anyone help? It is a curious problem.