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During the sign-up process, the address or phone number that you filled will not be listed publicly. This information is used for contacting you about account-related matters. More information here: Steps to open individual account
You need to fill in contact information for each app you publish in the store. This is different from the contact information you fill in when you register. Contact information for each app is optional, and you don't need to fill in your real address. Just a way that could contact you will be ok. More information here: Support contact info
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