@Dave1181It sounds like a part port out by EE (routing for sms is not completed), if you contact o2 Customer Services, they should be able to raise this with EE and get them to complete the port out.
You will need to call o2 on 202 from your handset or the numbers on
https://www.o2.co.uk/contactus
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This is not customer services and we dont have access to your account
I do not work for o2 or any VMo2 /Telefonica/Liberty Global Company