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Pay Your Bill Over the Phone. Anyone looking to pay National Grid by way of telephone simply has to call the company’s pay-by-phone automated system. The number to dial is (800) 233-5325.How do I pay my National Grid online?
Customers can pay a National Grid bill online by visiting the official National Grid website and setting up a one-time bill payment through their checking or savings account or through Western Union Speedpay by debit or credit card.