To know if your blocked contacts on whatsapp will remain blocked if change your whatsapp account to new device read the follwing explanation:
When you are switching the number in whatsapp that means you are making an new account consequently the blocked contacts will be unblocked list in your new account. On other hand if you have switched the sim and your whatsapp number stays the same ,at that time the blocked contacts will stay blocked through backing up whole your former files.
