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There are two reasons.
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The first reason is that this broadband is a contract broadband, requiring users to recharge a certain amount of phone fees to handle. For example, pre-deposit 300 yuan, a monthly guarantee of 58, free of charge a 100m broadband, which is based on the user's broadband activities to handle.
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The second is a package of broadband, but with a mobile phone number as an account, the package of 300 yuan will be charged to the account first, and then deducted from the account after the broadband takes effect next month
Bundled consumption, forced consumption by operators.