How does 30 days notice work when cancelling an agreement?

[wireless]

I want to cancel several wireless lines with Rogers but i understand they require 30 days notice. I would like to keep the numbers. Can I give my 30 days, then port out near the end of the 30 days like a a few days before, just so I dont have to pay for the full 30 days of dead air (maybe just a...

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