What do you mean that it's saying "SIM 48 data is locked"?
What is the exact message and where and when does it appear?
What is the "unlock button"?
Is your APN configured as follows?
https://community.48.ie/t5/The-Knowledgebase/My-Internet-is-not-working/ta-p/45928
Do you have a network connection?
Are calls and texts working ok?
