Call Back:
514: 320-xxx-xxxx - Montreal
450: 320-xxx-xxxx - Quebec
819: 320-xxx-xxxx - Quebec
Call, hang-up, open, hang-up
might be outdated
In Bell Canada territory, +1-areacode-320 was formerly reserved for 320-xxxx test numbers; in all known instances, these numbers were moved to the 958-xxxx range
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en.wikipedia.org/wiki/Au ··· _circuit