6. Does the person who got my old phone number have access to my WhatsApp acc...

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As for group messages, they are only available for reading from the moment you join the chat, all previous correspondence is hidden.

7 Ways to Use Your Old Smartphone
Your account data and correspondence in the messenger are stored on your WhatsApp Number List smartphone and are not visible to others, even if your number has been transferred to another user. However, you should still protect your data with a few simple steps:

Send all your contacts the new phone number and ask them to update it in their phone book.
Delete your old account from WhatsApp in the settings (in Android - in "account information", in iOS - in "chat", select the function "Delete my account"). This will log you out of all chats, the correspondence history will disappear.
Connect a new phone in the messenger and update the status.


7. Are there any paid services in WhatsApp?
From time to time, messages are published in chats that the WhatsApp messenger is about to become paid, is there any reason for this?

There are no paid features in WhatsApp: free trial periods were once announced, but they were cancelled several years ago. Facebook, which bought the messenger, wants to monetize it, but not by charging for the service, but with the help of advertising. Therefore, they are planning to introduce advertisements in the application soon.

8. How can I permanently delete another person's contact from my account?
You can remove an unwanted user from your contact list and block them in WhatsApp so that you no longer receive messages from them. You can make settings in the contact card or in the menu, in the account privacy section. You will stop receiving letters from this person, but you will remain in their contacts - in the phone book and messenger.