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If your phone is lost or stolen, you can deactivate Viber by reactivating your account with the same phone number on a new phone. Viber will be closed on the old device after you set it up on a fresh mobile phone with the same number.
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How to Deactivate Viber Account
If your phone is lost or stolen, you can deactivate Viber by reactivating your account with the same phone number on a new phone. Viber will be closed on the old device after you set it up on a fresh mobile phone with the same number.
If you’ve misplaced your phone or it’s been stolen, you may deactivate Viber by reactivating your account with the same number on a new phone. Your old device’s account will be closed when you set up Viber on a new phone, and no one will be able to access the chats saved there.
If you insert a new SIM card, Viber will recognize it. … This implies that you will be unable to access your Viber account (unless you still have access to your old SIM card and can receive an activation SMS/phone call) and that your conversations will be lost.