Credit ratings agency wrote to me about a hack, but how did it get my details?

I have never dealt with Equifax and don't have a mortgage, credit card or loan

I recently received a letter from Equifax, the credit ratings agency, telling me that my personal details had been hacked in May. I do not have a direct relationship with Equifax and do not have a mortgage, do not use a credit card and have no loans. Equifax couldn't tell me any more. What can I do to protect myself. I have already taken out Cifas fraud protection. NP, London

The most likely outcome is that Equifax carried out a credit check when you took on a mobile phone contract.

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