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Number Type:X(Exception, the number block is technically not active but residual, functioning telephone numbers from the block may still exist. The block is contaminated as a side effect of number portability. United States only.)
This is the United States Number Type:X(Exception, the number block is technically not active but residual, functioning telephone numbers from the block may still exist. The block is contaminated as a side effect of number portability. United States only.) Area Code Database page list. You can click the title to browse the detail information.