@ElaineB
I'll guess you are using a Samsung phone as this issue is being reported across all networks with customers with Samsung phones.
They suggest you back up all texts then delete them all to fix the issue.
Samsung support can be contacted here https://www.samsung.com/uk/support/contact/
Here's a similar thread on EE forum too https://community.ee.co.uk/t5/Calls/Calls-received-from-UK-show-as-International-Calls/td-p/943275
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