What free services should I register for that require a phone number while I have burner phone service, just to have an account should I need it in future?

Title. I have myself a burner number and recall chatgpt wants a phone number on registration, so I'll be making an account there with it. But what other services should I jump on? Amazon perhaps, if I ever need a firestick semi-anonymized? Though ama is looking to stop sideloading on future models if I remember some headline correctly.

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