I am doing the same, I called Teksavvy and this was their suggestion.
Move the Internet first. Call Bell, cancel, get the notice of the last day of service. Call Teksavvy when ready (they need 5 days lead time). I called Bell yesterday and my last day of service is May 3rd. I'll probably call Teksavvy next week as my internet connection is vital and 1 month of paying for both is small potatoes compared to driving downtown for a week or 2.
Once the Internet is with Teksavvy call them back to port over your phoneline(s). You don't need to cancel phone service with Bell. Teksavvy can transfer it for you.
Sadly I can't transfer my TV service to Teksavvy Not sure what I'm going to do there but I made it clear to Bell that all my services will be cancelled in the next 2 months and they can thank UBB.
This I was told is the best way to do it if you want to avoid any possible interruptions to service.
@notsure, it might be worth waiting a month to see what happens with UBB. Once Bell "accidentally" disconnects your grandfathered DSL package, you won't be able to get it back (from what I've read here).
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