iPhone will only work with WiFi.
Not connecting to any network for 4G or calls/texts in UK.
However, it did connect in France.
(Have tried Airplane mode, rebooting, taking sim in/out).
Hi there @NDbythesea, welcome to our forum and thanks for your post.
I'm sorry to see that you have no service on your iPhone, have you just come back from France or have you been back in the UK for a while?
As well as rebooting the handset have you been able to reset the network settings in the phone to see if this helps? I would also switch the carrier network option to manual then select a network to connect to.
If you still need help after trying these things, please let us know, we will be happy to help.