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Should optical modem buy one himself? The optical modem provided by the operator is for rent, and the SN code is tied to your broadband account. If it breaks, it can be replaced or upgraded for free. ； Cats you buy yourself must first go through the registration process. After I have calculated the three accounts, plus the trouble I spent with my companion on the night when I bought and exchanged cats, I will give you a straightforward answer.: Who should use the gift, who deserves to buy it, and how to implement it after buying it. ...