Ipad three-guarantee certificate refers to warranty, replacement and return, and three-guarantee certificate refers to purchase invoice, warranty card and commitment letter. Within the validity period of the three guarantees, the user has the right to repair, replace or return the goods with the invoice and the three guarantees certificate. If the invoice and the three-guarantee certificate are lost, valid evidence such as the bottom copy of the invoice or its copy can be provided to prove that the mobile phone product is within the validity period of the three-guarantee.