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In page North American Numbering Plan:

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In case of exhaustion, various plans are discussed for expanding the numbering plan. One option is to add the digit 1 or 0 either at the beginning or at the end of the area code, or prefixing it to the seven-digit subscriber number. This would require eleven-digit dialing even for local calls between any two NANP numbers. Another proposal introduces the digit 9 into the area code in the format x9xx, so that, for example, San Francisco's 415 would become 4915. Other proposals include reallocating blocks of numbers assigned to smaller long-distance carriers or unused reserved services.[citation needed]