How did the storage of my Doro PhoneEasy 508 diminish?

Small storage space. I love my Doro 508 but the storage space seems to have 'shrunk' . I now only have storage for 15 texts, (total incoming and sent) Why is this? I'm sure it had a far bigger storage capacity before.

Why can't it store so much? Nothing left to delete, have to delete after very text!!!

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