| 11. | There is no number pooling and rate centres are typically not amalgamated when the corresponding municipalities disappear.
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| 12. | Number portability usually has geographic limitations, such as an a competitor within the same rate centre.
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| 13. | Many of Canada's larger cities are split between multiple rate centres that have never been amalgamated.
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| 14. | It would also have been extremely difficult to split Toronto, since it is a single rate centre.
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| 15. | Every competing carrier is issued blocks of 10, 000 numbers for every rate centre where it offers service.
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| 16. | Much like FX service rates depend on the distance between rate centres, FCO service prices depend on the distance between exchanges.
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| 17. | Elsa survives as a rate centre only because it was eclipsed by relatively stable Keno, which is served by the same exchange.
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| 18. | A similar " FCO " service provided no difference in local calling area ( the distant exchange is in the same rate centre ).
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| 19. | Each CLEC is assigned blocks of 10, 000 numbers for every rate centre where it plans to offer service, no matter how small.
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| 20. | While most regions do not need that many phone numbers, once a prefix is assigned to a rate centre, it cannot be allocated elsewhere.
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