The reason why the home broadband can not be used after the mobile phone payment is that you have just paid the phone bill, and the broadband signal has not reacted.
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The first thing to exclude is that you have not paid enough phone bills, and the phone is still in arrearage.
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The second thing you need to check is that the power supply to your home broadband is working.
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The third point is to see if the router is working properly. You can disconnect the power in each plug of the router and try it again.